{"id":2957,"date":"2026-09-06T13:25:23","date_gmt":"2026-09-06T20:25:23","guid":{"rendered":"https:\/\/www.ultalabtests.com\/blog\/?p=2957"},"modified":"2026-09-06T13:25:27","modified_gmt":"2026-09-06T20:25:27","slug":"primary-hyperparathyroidism-high-calcium-pth-test","status":"publish","type":"post","link":"https:\/\/www.ultalabtests.com\/blog\/hormone\/parathyroid-diseases-pth\/primary-hyperparathyroidism-high-calcium-pth-test\/","title":{"rendered":"Primary Hyperparathyroidism: What High Calcium and PTH Reveal"},"content":{"rendered":"\n<div class=\"ulta-phpt-article\">\n<p class=\"phpt-subtitle\"><strong>Why calcium, PTH, vitamin D, kidney function, and urine calcium must be interpreted together.<\/strong><\/p>\n\n<p><strong>Primary hyperparathyroidism testing starts with a relationship: when blood calcium rises, parathyroid hormone (PTH) should fall.<\/strong> A PTH result that stays elevated\u2014or is not sufficiently suppressed despite being inside the laboratory range\u2014can indicate a parathyroid-driven problem. A single abnormal result does not establish the diagnosis. <sup class=\"phpt-reference\"><a href=\"#phpt-reference-1\" aria-label=\"Reference 1\">[1]<\/a>, <a href=\"#phpt-reference-2\" aria-label=\"Reference 2\">[2]<\/a><\/sup><\/p>\n\n<p>An unexpected high blood calcium result, called hypercalcemia, on a <a href=\"https:\/\/www.ultalabtests.com\/test\/comprehensive-metabolic-panel-test-cmp\">comprehensive metabolic panel<\/a> is often the first clue. The next step is a focused evaluation, not a larger collection of unrelated tests. This guide explains how clinicians connect the blood results, investigate look-alike conditions, and assess the kidneys and bones. <sup class=\"phpt-reference\"><a href=\"#phpt-reference-1\" aria-label=\"Reference 1\">[1]<\/a>, <a href=\"#phpt-reference-2\" aria-label=\"Reference 2\">[2]<\/a><\/sup><\/p>\n\n<p><em>Ulta Lab Tests offers access to many of the blood and urine tests discussed below where available. This article is educational; ordering a test does not replace a clinician\u2019s diagnosis, imaging, bone-density assessment, or treatment plan.<\/em><\/p>\n\n<figure class=\"wp-block-image size-large phpt-image\" style=\"max-width:620px;margin:1.75rem auto;\">\n<img src=\"https:\/\/i0.wp.com\/www.ultalabtests.com\/blog\/wp-content\/uploads\/2026\/07\/primary-hyperparathyroidism-high-calcium-pth-test-square-Large.jpeg?quality=100&amp;resize=1024%2C1024&amp;ssl=1\" alt=\"Woman with highlighted parathyroid glands beside high calcium and PTH blood test graphics for primary hyperparathyroidism.\" width=\"1024\" height=\"1024\" loading=\"eager\" decoding=\"async\" fetchpriority=\"high\" style=\"display:block;max-width:100%;height:auto;\">\n<figcaption>High calcium is a reason to examine the PTH response, not to diagnose a parathyroid disorder from one result. Values shown in this illustration are examples, not universal diagnostic cutoffs.<\/figcaption>\n<\/figure>\n\n<h2 id=\"phpt-key-takeaways\">Key takeaways<\/h2>\n<ul>\n<li>High calcium should suppress PTH. A \u201cnormal\u201d PTH can therefore be inappropriate when calcium is elevated.<\/li>\n<li>Confirm the calcium\u2013PTH pattern and interpret it with albumin, vitamin D status, kidney function, and medications.<\/li>\n<li>High PTH with normal calcium is not automatically primary hyperparathyroidism; secondary causes must be investigated.<\/li>\n<li>Urine calcium helps assess calcium excretion and possible familial hypocalciuric hypercalcemia (FHH), but no single urine cutoff settles the diagnosis.<\/li>\n<li>Kidney imaging and three-site bone-density scans (DXA) answer questions that blood tests cannot. Follow-up should distinguish routine monitoring from tests needed only for a clinical indication. <sup class=\"phpt-reference\"><a href=\"#phpt-reference-1\" aria-label=\"Reference 1\">[1]<\/a>, <a href=\"#phpt-reference-2\" aria-label=\"Reference 2\">[2]<\/a><\/sup><\/li>\n<\/ul>\n\n<p><strong>When not to wait:<\/strong> New confusion, fainting, profound weakness, repeated vomiting, inability to stay hydrated, or significant heart-rhythm symptoms with high calcium need urgent medical assessment. A markedly elevated calcium result also warrants prompt clinician contact, even without obvious symptoms. The repeat-testing intervals below are not instructions to delay care. <sup class=\"phpt-reference\"><a href=\"#phpt-reference-1\" aria-label=\"Reference 1\">[1]<\/a>, <a href=\"#phpt-reference-4\" aria-label=\"Reference 4\">[4]<\/a><\/sup><\/p>\n\n<nav aria-label=\"Article sections\"><p><strong>In this guide:<\/strong> <a href=\"#phpt-results\">Result patterns<\/a> \u00b7 <a href=\"#phpt-tests\">Related tests<\/a> \u00b7 <a href=\"#phpt-normocalcemic\">Normal calcium with high PTH<\/a> \u00b7 <a href=\"#phpt-urine\">Urine calcium and FHH<\/a> \u00b7 <a href=\"#phpt-surgery\">Surgery criteria<\/a> \u00b7 <a href=\"#phpt-monitoring\">Monitoring<\/a> \u00b7 <a href=\"#phpt-faq\">FAQs<\/a><\/p><\/nav>\n\n<h2 id=\"phpt-definition\">What is primary hyperparathyroidism?<\/h2>\n<p>Primary hyperparathyroidism, or PHPT, occurs when one or more parathyroid glands release PTH inappropriately for the circulating calcium concentration. These small glands are near the thyroid, but they perform a different job: regulating calcium through effects on bone, the kidneys, and vitamin D\u2013dependent intestinal absorption. <sup class=\"phpt-reference\"><a href=\"#phpt-reference-1\" aria-label=\"Reference 1\">[1]<\/a>, <a href=\"#phpt-reference-2\" aria-label=\"Reference 2\">[2]<\/a><\/sup><\/p>\n<p>The usual cause is a noncancerous growth called an adenoma; sometimes several glands are overactive. Parathyroid cancer is rare. Many people have no obvious symptoms when the condition is discovered. Feeling well does not establish that bone density and kidney health are unaffected. <sup class=\"phpt-reference\"><a href=\"#phpt-reference-1\" aria-label=\"Reference 1\">[1]<\/a><\/sup><\/p>\n<p><strong>Primary<\/strong> means the problem originates in the glands. In <strong>secondary hyperparathyroidism<\/strong>, the glands increase PTH in response to another problem, such as vitamin D deficiency, reduced kidney function, inadequate calcium intake, or malabsorption. Those situations require different interpretation and management. <sup class=\"phpt-reference\"><a href=\"#phpt-reference-2\" aria-label=\"Reference 2\">[2]<\/a><\/sup><\/p>\n<figure class=\"wp-block-image size-large phpt-image\" style=\"max-width:900px;margin:1.75rem auto;\">\n<img src=\"https:\/\/i0.wp.com\/www.ultalabtests.com\/blog\/wp-content\/uploads\/2026\/08\/calcium-pth-feedback-primary-hyperparathyroidism.webp?quality=100&amp;resize=1024%2C768&amp;ssl=1\" alt=\"Side-by-side diagram comparing normal calcium\u2013PTH feedback with primary hyperparathyroidism, where PTH remains nonsuppressed as calcium rises.\" width=\"1024\" height=\"768\" loading=\"lazy\" decoding=\"async\" style=\"display:block;max-width:100%;height:auto;\">\n<figcaption>Normally, rising calcium reduces PTH release. In a parathyroid-driven pattern, PTH remains higher than it should be for the calcium concentration.<\/figcaption>\n<\/figure>\n\n<h2 id=\"phpt-when-testing\">When should a calcium\u2013PTH evaluation be considered?<\/h2>\n<p>Discuss targeted testing with a healthcare professional after an unexplained high calcium result, elevated PTH, recurrent kidney stones, osteoporosis, or a low-trauma fracture\u2014a break after relatively minor trauma. A history of lifelong mild hypercalcemia or relatives with high calcium is also important. <sup class=\"phpt-reference\"><a href=\"#phpt-reference-1\" aria-label=\"Reference 1\">[1]<\/a>, <a href=\"#phpt-reference-2\" aria-label=\"Reference 2\">[2]<\/a><\/sup><\/p>\n<p>Fatigue, constipation, weakness, thirst, frequent urination, and concentration problems can occur with hypercalcemia, but they are not specific to PHPT. Their presence alone is not a reason to assume a parathyroid disorder or purchase broad hormone, autoimmune, or nutrient panels. Pregnancy with abnormal calcium requires prompt specialist guidance because evaluation and management differ. <sup class=\"phpt-reference\"><a href=\"#phpt-reference-1\" aria-label=\"Reference 1\">[1]<\/a>, <a href=\"#phpt-reference-2\" aria-label=\"Reference 2\">[2]<\/a><\/sup><\/p>\n\n<h2 id=\"phpt-results\">How to understand high calcium and PTH results<\/h2>\n<p><strong>Ask whether PTH is appropriate for the calcium level\u2014not simply whether it is flagged high.<\/strong> A reference interval describes results in a comparison population; it does not replace the normal feedback relationship between these two measurements. <sup class=\"phpt-reference\"><a href=\"#phpt-reference-1\" aria-label=\"Reference 1\">[1]<\/a>, <a href=\"#phpt-reference-5\" aria-label=\"Reference 5\">[5]<\/a><\/sup><\/p>\n<div class=\"phpt-table-wrap\" role=\"region\" aria-label=\"Calcium and PTH interpretation table\" tabindex=\"0\" style=\"overflow-x:auto;\">\n<table>\n<thead><tr><th scope=\"col\">Result pattern<\/th><th scope=\"col\">What it may mean<\/th><th scope=\"col\">What needs clarification<\/th><\/tr><\/thead>\n<tbody>\n<tr><td>High calcium + high PTH<\/td><td>PTH-mediated hypercalcemia; PHPT is an important possibility.<\/td><td>Confirm persistence and consider medications, FHH, and kidney-related context.<\/td><\/tr>\n<tr><td>High calcium + normal-range PTH that is not suppressed<\/td><td>PHPT remains possible despite the absence of a high-PTH flag.<\/td><td>Interpret the paired values, rather than dismissing the pattern as normal.<\/td><\/tr>\n<tr><td>High calcium + suppressed PTH<\/td><td>Points toward a non-PTH cause of hypercalcemia.<\/td><td>Clinician-directed evaluation for other causes; it is not a reason to focus only on the parathyroids.<\/td><\/tr>\n<tr><td>Normal calcium + high PTH<\/td><td>Often a secondary response; normocalcemic PHPT is a diagnosis of exclusion.<\/td><td>Vitamin D, kidney function, calcium intake, malabsorption, medications, and repeated total and ionized calcium.<\/td><\/tr>\n<tr><td>Low calcium + high PTH<\/td><td>An appropriate secondary PTH response to low calcium is more likely than classic hypercalcemic PHPT.<\/td><td>Assess vitamin D, kidney function, magnesium, calcium intake, and absorption according to the clinical history. <sup class=\"phpt-reference\"><a href=\"#phpt-reference-5\" aria-label=\"Reference 5\">[5]<\/a><\/sup><\/td><\/tr>\n<tr><td>Mild high calcium + low urinary calcium<\/td><td>FHH is possible, but this pattern also occurs in other settings.<\/td><td>Collection quality, clearance-ratio interpretation, family history, medications, and sometimes genetics.<\/td><\/tr>\n<\/tbody>\n<\/table><\/div>\n<p>These patterns guide evaluation rather than establish a diagnosis on their own. <sup class=\"phpt-reference\"><a href=\"#phpt-reference-1\" aria-label=\"Reference 1\">[1]<\/a>, <a href=\"#phpt-reference-2\" aria-label=\"Reference 2\">[2]<\/a><\/sup> For more about flags, reference intervals, and trends, see <a href=\"https:\/\/www.ultalabtests.com\/blog\/lab-testing-knowledge-center\/how-to-read-lab-results\/\">How to Read and Understand Your Lab Results<\/a>.<\/p>\n<figure class=\"wp-block-image size-large phpt-image\" style=\"max-width:900px;margin:1.75rem auto;\">\n<img src=\"https:\/\/i0.wp.com\/www.ultalabtests.com\/blog\/wp-content\/uploads\/2026\/08\/primary-hyperparathyroidism-calcium-pth-patterns.webp?quality=100&amp;resize=1024%2C768&amp;ssl=1\" alt=\"Calcium\u2013PTH matrix showing five result combinations and why each pattern requires clinical interpretation rather than diagnosis from one result.\" width=\"1024\" height=\"768\" loading=\"lazy\" decoding=\"async\" style=\"display:block;max-width:100%;height:auto;\">\n<figcaption>The relationship between calcium and PTH is more informative than either laboratory flag alone. Overlapping patterns require clinical assessment and, when appropriate, repeat testing.<\/figcaption>\n<\/figure>\n\n<h2 id=\"phpt-tests\">Primary hyperparathyroidism testing: related blood and urine tests<\/h2>\n<p>The core biochemical evaluation connects calcium, albumin, intact PTH, 25-hydroxyvitamin D, phosphorus, and kidney function. Ionized calcium and urine studies answer additional questions when appropriate. The linked tests below are options to discuss with a clinician, not a shopping list that everyone needs. <sup class=\"phpt-reference\"><a href=\"#phpt-reference-2\" aria-label=\"Reference 2\">[2]<\/a><\/sup><\/p>\n<figure class=\"wp-block-image size-large phpt-image\" style=\"max-width:900px;margin:1.75rem auto;\">\n<img src=\"https:\/\/i0.wp.com\/www.ultalabtests.com\/blog\/wp-content\/uploads\/2026\/08\/primary-hyperparathyroidism-calcium-pth-testing-hero.webp?quality=100&amp;resize=1024%2C576&amp;ssl=1\" alt=\"Front-facing medical illustration linking the parathyroid glands and blood testing with calcium, PTH, vitamin D, kidney function, and bone health.\" width=\"1024\" height=\"576\" loading=\"lazy\" decoding=\"async\" style=\"display:block;max-width:100%;height:auto;\">\n<figcaption>A focused evaluation connects the calcium\u2013PTH relationship with vitamin D status, kidney function, urinary calcium, and skeletal assessment.<\/figcaption>\n<\/figure>\n<div class=\"phpt-table-wrap\" role=\"region\" aria-label=\"Related laboratory tests and limitations\" tabindex=\"0\" style=\"overflow-x:auto;\">\n<table>\n<thead><tr><th scope=\"col\">Test or option<\/th><th scope=\"col\">What it contributes<\/th><th scope=\"col\">Important limitation<\/th><\/tr><\/thead>\n<tbody>\n<tr><td><a href=\"https:\/\/www.ultalabtests.com\/test\/calcium\">Calcium Test<\/a> and <a href=\"https:\/\/www.ultalabtests.com\/test\/albumin-alb\">Albumin Test<\/a><\/td><td>Total calcium is the initial signal; albumin helps interpret its protein-bound portion.<\/td><td>Abnormal total calcium does not identify the cause. Albumin-based adjustment formulas are estimates.<\/td><\/tr>\n<tr><td><a href=\"https:\/\/www.ultalabtests.com\/test\/pth-intact-test\">PTH Intact Test<\/a><\/td><td>Shows whether the parathyroid response fits the calcium concentration.<\/td><td>Normal-range PTH can be inappropriate with high calcium. Some assays are affected by biotin.<\/td><\/tr>\n<tr><td><a href=\"https:\/\/www.ultalabtests.com\/test\/calcium-ionized-test\">Calcium Ionized Test<\/a><\/td><td>Measures the unbound, biologically active calcium fraction.<\/td><td>Particularly relevant to suspected normocalcemic disease or discordant total calcium; collection and handling matter.<\/td><\/tr>\n<tr><td><a href=\"https:\/\/www.ultalabtests.com\/test\/vitamin-d-25-hydroxy-total-test\">Vitamin D 25-Hydroxy Total Immunoassay Test<\/a><\/td><td>Assesses vitamin D status, which can explain or contribute to PTH elevation.<\/td><td>Low vitamin D does not exclude coexisting PHPT. This is different from measuring active 1,25-dihydroxyvitamin D.<\/td><\/tr>\n<tr><td><a href=\"https:\/\/www.ultalabtests.com\/test\/phosphate-as-phosphorus\">Phosphate (as Phosphorus) Test<\/a><\/td><td>Helps interpret mineral balance; PTH can increase renal phosphorus loss.<\/td><td>Low or low-normal phosphorus is supportive context, not a diagnostic requirement.<\/td><\/tr>\n<tr><td><a href=\"https:\/\/www.ultalabtests.com\/test\/creatinine\">Creatinine Test<\/a> or <a href=\"https:\/\/www.ultalabtests.com\/test\/renal-function-panel\">Renal Function Panel Test<\/a><\/td><td>Provides kidney-function information; the renal panel also includes calcium, albumin, and phosphorus.<\/td><td>Reduced kidney function may cause secondary PTH elevation. It does not establish that PHPT caused the kidney problem.<\/td><\/tr>\n<tr><td><a href=\"https:\/\/www.ultalabtests.com\/test\/comprehensive-metabolic-panel-test-cmp\">Comprehensive Metabolic Panel Test - CMP<\/a><\/td><td>A broader chemistry option containing calcium, albumin, creatinine, and other chemistry measurements.<\/td><td>It does not include intact PTH, 25-hydroxyvitamin D, or phosphorus.<\/td><\/tr>\n<tr><td><a href=\"https:\/\/www.ultalabtests.com\/test\/calcium-24-hour-urine-test-with-creatinine\">Calcium 24 Hour Urine Test with Creatinine<\/a><\/td><td>Measures daily calcium excretion and provides urine creatinine for additional interpretation.<\/td><td>Collection errors and clinical factors affect results. A clearance-ratio calculation also requires appropriately paired blood measurements.<\/td><\/tr>\n<tr><td><a href=\"https:\/\/www.ultalabtests.com\/test\/magnesium-test\">Magnesium Test<\/a> and <a href=\"https:\/\/www.ultalabtests.com\/test\/alkaline-phosphatase-alp\">Alkaline Phosphatase Test<\/a><\/td><td>Selected additional tests when mineral disturbances, bone turnover, or another clinical question warrants them.<\/td><td>Neither is specific to PHPT; total alkaline phosphatase can reflect liver as well as bone sources.<\/td><\/tr>\n<\/tbody>\n<\/table><\/div>\n<p>Clinical roles and limitations are based on the guideline and laboratory education sources. <sup class=\"phpt-reference\"><a href=\"#phpt-reference-2\" aria-label=\"Reference 2\">[2]<\/a>, <a href=\"#phpt-reference-3\" aria-label=\"Reference 3\">[3]<\/a>, <a href=\"#phpt-reference-4\" aria-label=\"Reference 4\">[4]<\/a>, <a href=\"#phpt-reference-5\" aria-label=\"Reference 5\">[5]<\/a>, <a href=\"#phpt-reference-6\" aria-label=\"Reference 6\">[6]<\/a><\/sup><\/p>\n<p><strong>Avoid duplicate components:<\/strong> A <a href=\"https:\/\/www.ultalabtests.com\/test\/renal-function-panel\">Renal Function Panel Test<\/a> already supplies several chemistry measurements listed separately. A <a href=\"https:\/\/www.ultalabtests.com\/test\/comprehensive-metabolic-panel-test-cmp\">Comprehensive Metabolic Panel Test - CMP<\/a> overlaps many of them, although it does not include phosphorus. The <a href=\"https:\/\/www.ultalabtests.com\/test\/pth-intact-test-with-ionized-calcium\">PTH Intact Test with Ionized Calcium<\/a> is another combined option when those two measurements are requested. Review existing results and panel contents rather than automatically ordering every standalone test and panel.<\/p>\n\n<h2 id=\"phpt-context\">Why albumin, vitamin D, and kidney function change the interpretation<\/h2>\n<h3>Albumin: consider the protein, but do not treat a correction formula as the truth<\/h3>\n<p>Some calcium circulates bound to albumin, while ionized calcium is unbound. Albumin changes can alter total calcium without an equivalent change in its active fraction. The 2022 workshop uses albumin-adjusted calcium in its diagnostic definition. <sup class=\"phpt-reference\"><a href=\"#phpt-reference-2\" aria-label=\"Reference 2\">[2]<\/a>, <a href=\"#phpt-reference-4\" aria-label=\"Reference 4\">[4]<\/a><\/sup><\/p>\n<p>However, a 2025 study found that commonly used albumin-adjustment formulas could misclassify calcium status and did not consistently outperform unadjusted total calcium. Formulas are therefore not a substitute for clinical interpretation. When albumin is markedly abnormal or results disagree with the clinical picture, a clinician may use the <a href=\"https:\/\/www.ultalabtests.com\/test\/calcium-ionized-test\">Calcium Ionized Test<\/a> to clarify the finding. <sup class=\"phpt-reference\"><a href=\"#phpt-reference-3\" aria-label=\"Reference 3\">[3]<\/a><\/sup><\/p>\n\n<h3>Vitamin D: an important explanation for secondary PTH elevation<\/h3>\n<p>Inadequate vitamin D can reduce calcium absorption and stimulate PTH. For example, high PTH with normal calcium and a 25-hydroxyvitamin D result of 18 ng\/mL may reflect a secondary response. The vitamin D deficiency needs attention and reassessment before assuming normocalcemic PHPT. Primary disease and vitamin D deficiency can also coexist. <sup class=\"phpt-reference\"><a href=\"#phpt-reference-2\" aria-label=\"Reference 2\">[2]<\/a><\/sup><\/p>\n<p>In established PHPT, the workshop recommends maintaining 25-hydroxyvitamin D above 30 ng\/mL while remaining below the laboratory\u2019s upper limit, with cautious clinician-directed supplementation. This is a disease-management recommendation, not a universal wellness target. Do not self-prescribe high doses to force a laboratory result into range. <sup class=\"phpt-reference\"><a href=\"#phpt-reference-2\" aria-label=\"Reference 2\">[2]<\/a><\/sup> See <a href=\"https:\/\/www.ultalabtests.com\/blog\/vitamin-and-minerals\/vitamin-d-deficiency\/vitamin-d-tests\/\">the guide to vitamin D tests<\/a> for the distinction between vitamin D forms.<\/p>\n\n<h3>Kidney function: both a possible explanation and a complication to assess<\/h3>\n<p>Kidney disease changes vitamin D activation and mineral handling, which can raise PTH. High PTH with normal calcium and an estimated glomerular filtration rate (eGFR) of 35 mL\/min\/1.73 m<sup>2<\/sup>, for example, makes kidney-related secondary hyperparathyroidism a major consideration. An isolated PTH value cannot distinguish these possibilities. <sup class=\"phpt-reference\"><a href=\"#phpt-reference-2\" aria-label=\"Reference 2\">[2]<\/a><\/sup><\/p>\n<p>PHPT can also be associated with stones, calcium deposits, and reduced filtration. The evaluation must separate kidney disease contributing to high PTH from kidney complications occurring alongside PHPT; one does not automatically prove the other. <sup class=\"phpt-reference\"><a href=\"#phpt-reference-2\" aria-label=\"Reference 2\">[2]<\/a><\/sup> Read <a href=\"https:\/\/www.ultalabtests.com\/blog\/kidney\/kidney-health\/kidney-function-tests\/\">Kidney Function Tests<\/a> for the broader interpretation of filtration and urine markers.<\/p>\n\n<h2 id=\"phpt-normocalcemic\">High PTH with normal calcium: why the diagnosis takes longer<\/h2>\n<p><strong>Normocalcemic primary hyperparathyroidism requires persistently elevated PTH with both normal adjusted total calcium and normal ionized calcium, after secondary causes have been excluded.<\/strong> The workshop describes confirmation on at least two occasions over three to six months. <sup class=\"phpt-reference\"><a href=\"#phpt-reference-2\" aria-label=\"Reference 2\">[2]<\/a><\/sup><\/p>\n<p>The review includes vitamin D deficiency, chronic kidney disease, low calcium intake, malabsorption, medication effects, and excessive urinary calcium loss. Relevant history includes bariatric surgery and disorders affecting nutrient absorption. Correcting a secondary contributor and documenting what happens afterward can be more informative than repeatedly measuring PTH without addressing its context. <sup class=\"phpt-reference\"><a href=\"#phpt-reference-2\" aria-label=\"Reference 2\">[2]<\/a><\/sup><\/p>\n<p><strong>When celiac testing may be relevant:<\/strong> Celiac disease is one possible malabsorption-related explanation for secondary PTH elevation. When symptoms, nutritional deficiencies, or history support that possibility, a clinician may consider a <a href=\"https:\/\/www.ultalabtests.com\/test\/celiac-disease-comprehensive-panel\">Celiac Disease Comprehensive Panel<\/a>; this is not routine testing for everyone with high PTH. Discuss testing before starting a gluten-free diet because avoiding gluten can alter the results. People already avoiding gluten should review the diagnostic plan with their clinician rather than restarting gluten independently. <sup class=\"phpt-reference\"><a href=\"#phpt-reference-2\" aria-label=\"Reference 2\">[2]<\/a>, <a href=\"#phpt-reference-7\" aria-label=\"Reference 7\">[7]<\/a><\/sup><\/p>\n\n<p>A normal total calcium result alone is insufficient when ionized calcium has not been assessed. Likewise, a high PTH result should not trigger neck imaging before the biochemical explanation is clarified. <strong>Surgery criteria developed for hypercalcemic PHPT should not automatically be applied to normocalcemic disease;<\/strong> the workshop found insufficient evidence to establish surgical guidelines for that form. <sup class=\"phpt-reference\"><a href=\"#phpt-reference-2\" aria-label=\"Reference 2\">[2]<\/a><\/sup><\/p>\n\n<h2 id=\"phpt-pathway\">A practical testing sequence<\/h2>\n<h3>1. Establish the paired calcium\u2013PTH pattern<\/h3>\n<p>Review prior results and obtain calcium with albumin and PTH at the same evaluation, together with vitamin D, phosphorus, and kidney-function information. The specific combination of standalone tests and panels should match what is already available and what the clinician needs to clarify. <sup class=\"phpt-reference\"><a href=\"#phpt-reference-2\" aria-label=\"Reference 2\">[2]<\/a><\/sup><\/p>\n<h3>2. Confirm persistence and investigate competing explanations<\/h3>\n<p>For hypercalcemic PHPT, the workshop definition requires elevated albumin-adjusted calcium with elevated or inappropriately normal PTH on two occasions at least two weeks apart. Review hydration, illness, supplements, medications, and possible FHH. Use ionized calcium or urine testing when those questions require it. Severe or rapidly worsening abnormalities need faster assessment. <sup class=\"phpt-reference\"><a href=\"#phpt-reference-2\" aria-label=\"Reference 2\">[2]<\/a><\/sup><\/p>\n<p><strong>Illustrative trend:<\/strong> With normal, stable albumin and a sample calcium reference range of 8.6\u201310.2 mg\/dL, calcium results of 10.7 and 10.8 mg\/dL three weeks apart would both be elevated. PTH results of 62 and 65 pg\/mL might remain within a sample range of 15\u201365 pg\/mL, yet still be inappropriate for those calcium levels. These illustrative values show persistence\u2014not proof of PHPT or meaningful progression from a small numerical change.<\/p>\n<h3>3. Assess the kidneys and skeleton<\/h3>\n<p>When PHPT is established or strongly suspected, investigate urinary calcium and relevant mimics, kidney stones or calcium deposits, bone density, and vertebral fractures. These assessments can change management even when serum calcium is only mildly elevated. <sup class=\"phpt-reference\"><a href=\"#phpt-reference-2\" aria-label=\"Reference 2\">[2]<\/a><\/sup><\/p>\n<h3>4. Agree on treatment or structured observation<\/h3>\n<p>An endocrinologist or other qualified clinician integrates the findings, with an experienced parathyroid surgeon when appropriate. Follow-up is based on the diagnosis and risk\u2014not on automatically repeating every test in the original workup. <sup class=\"phpt-reference\"><a href=\"#phpt-reference-2\" aria-label=\"Reference 2\">[2]<\/a><\/sup><\/p>\n<figure class=\"wp-block-image size-large phpt-image\" style=\"max-width:660px;margin:1.75rem auto;\">\n<img src=\"https:\/\/i0.wp.com\/www.ultalabtests.com\/blog\/wp-content\/uploads\/2026\/08\/primary-hyperparathyroidism-testing-pathway.webp?quality=100&amp;resize=819%2C1024&amp;ssl=1\" alt=\"Four-step testing pathway to confirm calcium and PTH, investigate secondary causes, assess urine, kidney and bone effects, and determine clinical follow-up.\" width=\"819\" height=\"1024\" loading=\"lazy\" decoding=\"async\" style=\"display:block;max-width:100%;height:auto;\">\n<figcaption>The steps can overlap. Urine calcium and paired blood results help investigate FHH before that alternative is considered resolved; not every test is necessary for every patient.<\/figcaption>\n<\/figure>\n\n<h2 id=\"phpt-urine\">What 24-hour urine calcium reveals\u2014and what it cannot prove<\/h2>\n<p>The <a href=\"https:\/\/www.ultalabtests.com\/test\/calcium-24-hour-urine-test-with-creatinine\">Calcium 24 Hour Urine Test with Creatinine<\/a> helps quantify calcium excretion over a full day. It can contribute to stone-risk evaluation and to distinguishing PHPT from <strong>familial hypocalciuric hypercalcemia<\/strong>, or FHH, an inherited calcium-sensing disorder that often causes lifelong mild hypercalcemia with relatively low urinary calcium. <sup class=\"phpt-reference\"><a href=\"#phpt-reference-2\" aria-label=\"Reference 2\">[2]<\/a>, <a href=\"#phpt-reference-6\" aria-label=\"Reference 6\">[6]<\/a><\/sup><\/p>\n<p>Urine creatinine helps assess whether a collection is plausible, but it does not guarantee that every void was collected. The amount of calcium excreted also depends on kidney function, vitamin D, diet, sodium intake, and medications. One abnormal urine result does not identify the cause of hypercalcemia. <sup class=\"phpt-reference\"><a href=\"#phpt-reference-2\" aria-label=\"Reference 2\">[2]<\/a>, <a href=\"#phpt-reference-6\" aria-label=\"Reference 6\">[6]<\/a><\/sup><\/p>\n<h3>A urine calcium-to-creatinine ratio is not the same as a clearance ratio<\/h3>\n<p>The <strong>calcium-to-creatinine clearance ratio<\/strong>, or CCCR, uses urine calcium and creatinine together with corresponding serum calcium and creatinine. A simple urine calcium\/creatinine ratio, or the total calcium excreted per day, is not interchangeable with CCCR. Coordinate the urine collection and blood measurements with the ordering clinician. <sup class=\"phpt-reference\"><a href=\"#phpt-reference-2\" aria-label=\"Reference 2\">[2]<\/a><\/sup><\/p>\n<p>A CCCR below 0.01 favors FHH; 0.01\u20130.02 is an overlapping range; and values above 0.02 generally favor PHPT. However, people with PHPT can have low ratios, and people with FHH can have higher ones. <strong>No single threshold reliably separates everyone.<\/strong> <sup class=\"phpt-reference\"><a href=\"#phpt-reference-2\" aria-label=\"Reference 2\">[2]<\/a><\/sup><\/p>\n<figure class=\"wp-block-image size-large phpt-image\" style=\"max-width:900px;margin:1.75rem auto;\">\n<img src=\"https:\/\/i0.wp.com\/www.ultalabtests.com\/blog\/wp-content\/uploads\/2026\/08\/primary-hyperparathyroidism-urine-calcium-fhh.webp?quality=100&amp;resize=1024%2C768&amp;ssl=1\" alt=\"Overlapping CCCR continuum showing values below 0.01 favoring FHH, 0.01\u20130.02 overlapping, and values above 0.02 favoring primary hyperparathyroidism.\" width=\"1024\" height=\"768\" loading=\"lazy\" decoding=\"async\" style=\"display:block;max-width:100%;height:auto;\">\n<figcaption>A calcium-to-creatinine clearance ratio changes the level of suspicion; it does not independently diagnose FHH or primary hyperparathyroidism. Collection quality, medications, vitamin D, and kidney function affect interpretation.<\/figcaption>\n<\/figure>\n<p>Vitamin D deficiency, chronic kidney disease, thiazides, lithium, low calcium intake, and incomplete collection can complicate interpretation. Lifelong results and family history may be as important as the cutoff. Selected patients need genetic evaluation before surgery is considered, because parathyroid surgery generally does not correct the underlying calcium abnormality in FHH. <sup class=\"phpt-reference\"><a href=\"#phpt-reference-2\" aria-label=\"Reference 2\">[2]<\/a><\/sup><\/p>\n<p>Urine calcium above 250 mg\/day in women or 300 mg\/day in men is a renal surgery criterion in the workshop\u2019s framework for confirmed hypercalcemic PHPT. These are management thresholds in that setting\u2014not proof that PHPT caused every elevated urine-calcium result. <sup class=\"phpt-reference\"><a href=\"#phpt-reference-2\" aria-label=\"Reference 2\">[2]<\/a><\/sup><\/p>\n\n<h2 id=\"phpt-complications\">Why kidney and bone assessment matter even with mild calcium elevation<\/h2>\n<p><strong>A stable or mildly elevated calcium result does not describe the entire disease.<\/strong> Kidney stones and skeletal changes can be present without prominent symptoms. Blood and urine tests cannot replace the imaging needed to identify them. <sup class=\"phpt-reference\"><a href=\"#phpt-reference-1\" aria-label=\"Reference 1\">[1]<\/a>, <a href=\"#phpt-reference-2\" aria-label=\"Reference 2\">[2]<\/a><\/sup><\/p>\n<p>Kidney evaluation includes renal-function assessment and, as appropriate to the PHPT workup, imaging for stones or nephrocalcinosis, meaning calcium deposits in kidney tissue. People with stones or hypercalciuria may need a broader stone-risk evaluation because urinary calcium is only one contributor. <sup class=\"phpt-reference\"><a href=\"#phpt-reference-2\" aria-label=\"Reference 2\">[2]<\/a><\/sup><\/p>\n<p><strong>When urinalysis adds information:<\/strong> When stones, blood in the urine, or other urinary symptoms are part of the clinical picture, a clinician may include a <a href=\"https:\/\/www.ultalabtests.com\/test\/urinalysis-ua-complete\">Urinalysis Complete Test<\/a> to look for blood and other urinary abnormalities. This is symptom-directed testing, not a diagnostic test for PHPT and not a substitute for the <a href=\"https:\/\/www.ultalabtests.com\/test\/calcium-24-hour-urine-test-with-creatinine\">Calcium 24 Hour Urine Test with Creatinine<\/a> or kidney imaging. <sup class=\"phpt-reference\"><a href=\"#phpt-reference-8\" aria-label=\"Reference 8\">[8]<\/a><\/sup><\/p>\n\n<p>Bone evaluation uses dual-energy X-ray absorptiometry (DXA), a bone-density scan, at the <strong>lumbar spine, hip, and distal one-third radius<\/strong>. The radius matters because PHPT can particularly affect cortical bone, the hard outer layer of bone. Vertebral fracture assessment or spine imaging can reveal fractures not explained by the spine\u2019s bone-density value alone. <sup class=\"phpt-reference\"><a href=\"#phpt-reference-2\" aria-label=\"Reference 2\">[2]<\/a><\/sup><\/p>\n<figure class=\"wp-block-image size-large phpt-image\" style=\"max-width:900px;margin:1.75rem auto;\">\n<img src=\"https:\/\/i0.wp.com\/www.ultalabtests.com\/blog\/wp-content\/uploads\/2026\/08\/primary-hyperparathyroidism-kidney-bone-complications.webp?quality=100&amp;resize=1024%2C640&amp;ssl=1\" alt=\"Split infographic showing bone loss, osteoporosis, and fracture risk alongside high urine calcium, kidney stones, nephrocalcinosis, and reduced filtration.\" width=\"1024\" height=\"640\" loading=\"lazy\" decoding=\"async\" style=\"display:block;max-width:100%;height:auto;\">\n<figcaption>These findings require different tools: urine testing measures calcium excretion; blood-based estimates or measured clearance assess filtration. Kidney imaging detects stones or calcium deposits\u2014it does not measure urine calcium or filtration. DXA and vertebral assessment evaluate skeletal effects.<\/figcaption>\n<\/figure>\n<p><strong>Two illustrative examples:<\/strong> A postmenopausal patient with confirmed PHPT and a distal-radius T-score of \u22122.7 has an important skeletal finding even when lumbar-spine density looks reassuring. Another patient may have only mild hypercalcemia but a kidney stone on imaging. Either finding can support surgery under the appropriate guideline criteria. <sup class=\"phpt-reference\"><a href=\"#phpt-reference-2\" aria-label=\"Reference 2\">[2]<\/a><\/sup><\/p>\n<p>For the broader causes and evaluation of bone loss, see <a href=\"https:\/\/www.ultalabtests.com\/blog\/bone-joints\/osteoporosis\/osteoporosis-symptoms-bone-density-tests\/\">the osteoporosis and bone-density guide<\/a>. Laboratory measurements of calcium or alkaline phosphatase are not substitutes for DXA.<\/p>\n\n<h2 id=\"phpt-surgery\">When is parathyroid surgery recommended?<\/h2>\n<p>Parathyroidectomy is the only definitive curative treatment for PHPT. Surgery is recommended for symptomatic disease and for appropriately diagnosed, otherwise asymptomatic <strong>hypercalcemic PHPT<\/strong> when one or more of the following criteria is present, provided there is no contraindication. Decisions belong with the patient and qualified clinical team. <sup class=\"phpt-reference\"><a href=\"#phpt-reference-2\" aria-label=\"Reference 2\">[2]<\/a><\/sup><\/p>\n<div class=\"phpt-table-wrap\" role=\"region\" aria-label=\"Surgery criteria for hypercalcemic primary hyperparathyroidism\" tabindex=\"0\" style=\"overflow-x:auto;\">\n<table>\n<thead><tr><th scope=\"col\">Finding<\/th><th scope=\"col\">Fifth International Workshop criterion<\/th><\/tr><\/thead>\n<tbody>\n<tr><td>Serum calcium<\/td><td>More than 1.0 mg\/dL above the laboratory\u2019s upper limit of normal.<\/td><\/tr>\n<tr><td>Skeletal involvement<\/td><td>A vertebral fracture on assessment\/imaging, or bone density with a T-score of \u22122.5 or lower at an evaluated site.<\/td><\/tr>\n<tr><td>Reduced kidney function<\/td><td>eGFR below 60 mL\/min\/1.73 m<sup>2<\/sup>, or creatinine clearance below 60 mL\/min.<\/td><\/tr>\n<tr><td>Kidney stones or deposits<\/td><td>Nephrolithiasis or nephrocalcinosis on imaging.<\/td><\/tr>\n<tr><td>High urinary calcium<\/td><td>More than 250 mg\/day in women or more than 300 mg\/day in men.<\/td><\/tr>\n<tr><td>Age<\/td><td>Younger than 50 years.<\/td><\/tr>\n<\/tbody>\n<\/table><\/div>\n<p>The table summarizes the 2022 workshop\u2019s hypercalcemic PHPT recommendations. T-scores are used for postmenopausal women and men age 50 or older; younger adults require age-appropriate bone-density interpretation and already meet the age criterion when PHPT is confirmed. A fragility fracture also deserves specialist assessment. <sup class=\"phpt-reference\"><a href=\"#phpt-reference-2\" aria-label=\"Reference 2\">[2]<\/a><\/sup><\/p>\n<figure class=\"wp-block-image size-large phpt-image\" style=\"max-width:900px;margin:1.75rem auto;\">\n<img src=\"https:\/\/i0.wp.com\/www.ultalabtests.com\/blog\/wp-content\/uploads\/2026\/08\/primary-hyperparathyroidism-surgery-criteria.webp?quality=100&amp;resize=1024%2C768&amp;ssl=1\" alt=\"Infographic grouping surgery criteria for primary hyperparathyroidism by calcium, skeletal, renal, urine-calcium, and age findings.\" width=\"1024\" height=\"768\" loading=\"lazy\" decoding=\"async\" style=\"display:block;max-width:100%;height:auto;\">\n<figcaption>These criteria apply to appropriately evaluated hypercalcemic primary hyperparathyroidism. They should not automatically be applied to the normocalcemic form. An experienced clinical team determines whether surgery is appropriate.<\/figcaption>\n<\/figure>\n<p>Surgery can remain an option without these findings after shared decision-making. Conversely, meeting a numerical threshold does not replace confirmation of PHPT and investigation of important alternatives such as FHH. Fatigue, \u201cbrain fog,\u201d or cardiovascular findings alone do not establish that surgery will improve those problems. <sup class=\"phpt-reference\"><a href=\"#phpt-reference-2\" aria-label=\"Reference 2\">[2]<\/a><\/sup><\/p>\n<h3>Why neck imaging comes after diagnosis<\/h3>\n<p>Neck ultrasound, sestamibi scanning, and four-dimensional CT are localization tools used to plan an operation. They do not establish or exclude PHPT. A negative scan does not erase a biochemical diagnosis, and an apparent parathyroid nodule does not prove one. This differs from kidney imaging, which assesses complications rather than locating a gland. <sup class=\"phpt-reference\"><a href=\"#phpt-reference-2\" aria-label=\"Reference 2\">[2]<\/a><\/sup><\/p>\n\n<h2 id=\"phpt-monitoring\">Monitoring when surgery is not performed<\/h2>\n<p>For appropriately selected patients managed without surgery, the workshop distinguishes routine surveillance from studies ordered for a specific indication. The goal is to detect changes that affect management, not simply document that calcium remains high. <sup class=\"phpt-reference\"><a href=\"#phpt-reference-2\" aria-label=\"Reference 2\">[2]<\/a><\/sup><\/p>\n<div class=\"phpt-table-wrap\" role=\"region\" aria-label=\"Monitoring schedule for primary hyperparathyroidism\" tabindex=\"0\" style=\"overflow-x:auto;\">\n<table>\n<thead><tr><th scope=\"col\">Assessment<\/th><th scope=\"col\">Usual workshop-based follow-up<\/th><\/tr><\/thead>\n<tbody>\n<tr><td><a href=\"https:\/\/www.ultalabtests.com\/test\/calcium\">Calcium Test<\/a> and <a href=\"https:\/\/www.ultalabtests.com\/test\/vitamin-d-25-hydroxy-total-test\">Vitamin D 25-Hydroxy Total Immunoassay Test<\/a><\/td><td>Annually, with earlier checks when the clinical situation or treatment requires them.<\/td><\/tr>\n<tr><td>Kidney function<\/td><td>Annually. The workshop prefers creatinine clearance where practical; a clinician may use <a href=\"https:\/\/www.ultalabtests.com\/test\/creatinine-clearance\">Creatinine Clearance<\/a> or creatinine-based eGFR as appropriate.<\/td><\/tr>\n<tr><td><a href=\"https:\/\/www.ultalabtests.com\/test\/pth-intact-test\">PTH Intact Test<\/a><\/td><td>When clinically indicated\u2014not automatically every time calcium is measured.<\/td><\/tr>\n<tr><td>Three-site DXA<\/td><td>About every one to two years; the interval can differ when bone density is normal or circumstances change.<\/td><\/tr>\n<tr><td>Kidney imaging, vertebral imaging, and <a href=\"https:\/\/www.ultalabtests.com\/test\/calcium-24-hour-urine-test-with-creatinine\">Calcium 24 Hour Urine Test with Creatinine<\/a><\/td><td>When clinically indicated, rather than an automatic annual requirement for every patient.<\/td><\/tr>\n<\/tbody>\n<\/table><\/div>\n<p>A measured creatinine-clearance study requires its own timed-urine and blood arrangements; it is not the same as an eGFR estimate or a urine-calcium collection alone. Follow the exact order instructions.<\/p>\n<figure class=\"wp-block-image size-large phpt-image\" style=\"max-width:900px;margin:1.75rem auto;\">\n<img src=\"https:\/\/i0.wp.com\/www.ultalabtests.com\/blog\/wp-content\/uploads\/2026\/08\/primary-hyperparathyroidism-monitoring-schedule.webp?quality=100&amp;resize=1024%2C768&amp;ssl=1\" alt=\"PHPT monitoring timeline showing annual calcium, vitamin D, and kidney checks, PTH as indicated, DXA every one to two years, and renal testing as needed.\" width=\"1024\" height=\"768\" loading=\"lazy\" decoding=\"async\" style=\"display:block;max-width:100%;height:auto;\">\n<figcaption>Scheduled blood and bone assessments are different from indication-based PTH, urine, and imaging studies. A clinician may adjust the schedule to changes in health or treatment.<\/figcaption>\n<\/figure>\n<p><strong>Reassess the management plan<\/strong> if calcium consistently exceeds the surgical threshold, a low-trauma fracture or kidney stone develops, bone density declines significantly into the osteoporosis range, or kidney function meaningfully worsens. A small laboratory fluctuation is not automatically progression. New problems need evaluation rather than an assumption that PHPT explains them all. <sup class=\"phpt-reference\"><a href=\"#phpt-reference-2\" aria-label=\"Reference 2\">[2]<\/a><\/sup><\/p>\n\n<h2 id=\"phpt-nutrition-treatment\">Calcium intake, vitamin D, and treatment targets<\/h2>\n<p>Do not assume high blood calcium means dietary calcium should be severely restricted. In PHPT, marked restriction can stimulate more PTH. The workshop advises normal nutritional calcium intake and cautious correction of vitamin D deficiency, with amounts individualized to results, kidney health, stone history, and clinician guidance. <sup class=\"phpt-reference\"><a href=\"#phpt-reference-2\" aria-label=\"Reference 2\">[2]<\/a><\/sup><\/p>\n<p>Medication choices address different problems when surgery is not performed. Cinacalcet can lower calcium, whereas selected bone-directed medicines can improve bone density; neither is equivalent to removing the abnormal gland tissue. These decisions require medical supervision, not self-treatment based on a laboratory flag. <sup class=\"phpt-reference\"><a href=\"#phpt-reference-2\" aria-label=\"Reference 2\">[2]<\/a><\/sup> Broader nutrition questions belong in <a href=\"https:\/\/www.ultalabtests.com\/blog\/nutrition\/vitamin-nutrient-deficiency-tests\/\">Vitamin and Nutrient Deficiency Tests<\/a>, rather than an expanded PHPT test panel.<\/p>\n\n<h2 id=\"phpt-preparation\">Preparing for blood and 24-hour urine testing<\/h2>\n<p><strong>Use the instructions for the exact tests ordered.<\/strong> Fasting, collection timing, specimen handling, and urine-storage requirements are not identical for every test or panel. Maintain usual hydration unless your clinician has prescribed a fluid restriction or different instructions. <sup class=\"phpt-reference\"><a href=\"#phpt-reference-4\" aria-label=\"Reference 4\">[4]<\/a>, <a href=\"#phpt-reference-5\" aria-label=\"Reference 5\">[5]<\/a>, <a href=\"#phpt-reference-6\" aria-label=\"Reference 6\">[6]<\/a><\/sup><\/p>\n<p>Provide a complete list of medicines and supplements, including thiazides, lithium, calcium, vitamin D, calcium-containing antacids, osteoporosis medicines, and biotin. Biotin can produce falsely low PTH in some assays. Ask the laboratory and clinician about preparation rather than applying a universal supplement pause or stopping prescribed treatment yourself. <sup class=\"phpt-reference\"><a href=\"#phpt-reference-2\" aria-label=\"Reference 2\">[2]<\/a><\/sup><\/p>\n<p>For a timed urine collection, obtain the correct kit first and follow its start time, end time, and storage directions. Collect every required void during the specified period. Report missed samples or timing errors instead of assuming the collection can still be interpreted normally. Ask whether blood tests need to be coordinated with the collection. <sup class=\"phpt-reference\"><a href=\"#phpt-reference-6\" aria-label=\"Reference 6\">[6]<\/a><\/sup><\/p>\n<h3>Questions to take to your healthcare provider<\/h3>\n<p>Is my PTH appropriate for my calcium? Could vitamin D, kidney disease, intake, medicines, or FHH explain the pattern? Do I need ionized calcium, paired urine and blood measurements, kidney imaging, or three-site DXA? Which results would change the plan, and which tests actually need repeating?<\/p>\n\n<h2 id=\"phpt-ulta\">How Ulta Lab Tests can help<\/h2>\n<p>Ulta Lab Tests provides online access to many relevant blood and urine tests where available, with pricing displayed before ordering and results available through the patient account. Review the requested components and collection instructions before checkout. The <a href=\"https:\/\/www.ultalabtests.com\/blog\/lab-testing-knowledge-center\/direct-access-lab-testing\/\">Direct-Access Lab Testing: How It Works and What to Expect<\/a> guide explains the ordering, authorization, collection, and results process.<\/p>\n<p>Start with the clinical question and existing records. A <a href=\"https:\/\/www.ultalabtests.com\/test\/pth-intact-test\">PTH Intact Test<\/a>, <a href=\"https:\/\/www.ultalabtests.com\/test\/calcium\">Calcium Test<\/a>, <a href=\"https:\/\/www.ultalabtests.com\/test\/vitamin-d-25-hydroxy-total-test\">Vitamin D 25-Hydroxy Total Immunoassay Test<\/a>, or <a href=\"https:\/\/www.ultalabtests.com\/test\/calcium-24-hour-urine-test-with-creatinine\">Calcium 24 Hour Urine Test with Creatinine<\/a> may answer a specific question when selected appropriately; purchasing all of them does not itself establish a diagnosis. Share results with the clinician who can interpret them alongside imaging, medication history, and prior measurements.<\/p>\n\n<h2 id=\"phpt-faq\">Frequently asked questions<\/h2>\n<h3>Can PTH be normal in primary hyperparathyroidism?<\/h3>\n<p>Yes. A result can fall inside the laboratory interval yet remain too high for an elevated calcium level. Clinicians call this \u201cinappropriately normal\u201d PTH. It supports further evaluation, not an automatic diagnosis, because the paired pattern must be confirmed and other explanations considered. <sup class=\"phpt-reference\"><a href=\"#phpt-reference-1\" aria-label=\"Reference 1\">[1]<\/a>, <a href=\"#phpt-reference-2\" aria-label=\"Reference 2\">[2]<\/a><\/sup><\/p>\n<h3>Does one high calcium result mean I have PHPT?<\/h3>\n<p>No. Albumin, hydration, medicines, supplements, illness, and non-parathyroid causes can affect interpretation. The workshop\u2019s hypercalcemic PHPT definition requires qualifying calcium\u2013PTH measurements on two occasions at least two weeks apart. Markedly high calcium or concerning symptoms requires prompt assessment rather than waiting for that interval. <sup class=\"phpt-reference\"><a href=\"#phpt-reference-2\" aria-label=\"Reference 2\">[2]<\/a>, <a href=\"#phpt-reference-4\" aria-label=\"Reference 4\">[4]<\/a><\/sup><\/p>\n<h3>Can a comprehensive metabolic panel diagnose PHPT?<\/h3>\n<p>A <a href=\"https:\/\/www.ultalabtests.com\/test\/comprehensive-metabolic-panel-test-cmp\">Comprehensive Metabolic Panel Test - CMP<\/a> can reveal high calcium and provide albumin and kidney markers, but it does not include PTH. It cannot establish PHPT by itself. The evaluation usually needs a <a href=\"https:\/\/www.ultalabtests.com\/test\/pth-intact-test\">PTH Intact Test<\/a> and relevant mineral and vitamin D information, with additional testing selected according to the findings. <sup class=\"phpt-reference\"><a href=\"#phpt-reference-2\" aria-label=\"Reference 2\">[2]<\/a><\/sup><\/p>\n<h3>Can vitamin D deficiency cause high PTH?<\/h3>\n<p>Yes. Vitamin D deficiency can stimulate PTH even when calcium is normal. It can also coexist with PHPT. Measuring vitamin D helps distinguish these situations, but supplement doses and reassessment should be clinician-directed, particularly when calcium is already high or there is a history of kidney stones. <sup class=\"phpt-reference\"><a href=\"#phpt-reference-2\" aria-label=\"Reference 2\">[2]<\/a><\/sup><\/p>\n<h3>Does low urine calcium prove familial hypocalciuric hypercalcemia?<\/h3>\n<p>No. FHH is one explanation, but vitamin D deficiency, kidney disease, medicines, intake, and collection problems also matter. The clearance ratio uses both blood and urine measurements and has substantial overlap between FHH and PHPT. Selected patients need genetic evaluation before a surgical decision. <sup class=\"phpt-reference\"><a href=\"#phpt-reference-2\" aria-label=\"Reference 2\">[2]<\/a><\/sup><\/p>\n<h3>Can a normal parathyroid scan rule out PHPT?<\/h3>\n<p>No. PHPT is established through biochemical and clinical evaluation, not a neck scan. Localization imaging is generally obtained after surgery has been selected to help plan the procedure. A negative localization study can occur despite PHPT and should be interpreted by the treating clinical team. <sup class=\"phpt-reference\"><a href=\"#phpt-reference-2\" aria-label=\"Reference 2\">[2]<\/a><\/sup><\/p>\n<h3>Do I need every test repeated every year?<\/h3>\n<p>No. For appropriate observation without surgery, annual calcium, vitamin D, and kidney assessment are distinguished from PTH, urine studies, and imaging ordered when indicated. DXA is generally considered every one to two years. Your schedule can change with new symptoms, treatment, or evidence of progression. <sup class=\"phpt-reference\"><a href=\"#phpt-reference-2\" aria-label=\"Reference 2\">[2]<\/a><\/sup><\/p>\n<h3>What if calcium rises again after parathyroid surgery?<\/h3>\n<p>Renewed hypercalcemia deserves clinical evaluation rather than an assumption that surgery rules out future problems. The clinician reviews calcium with PTH, postoperative history, medicines, supplements, and other possible causes. Depending on timing and findings, persistent or recurrent PHPT may be considered. Do not restart treatment independently. <sup class=\"phpt-reference\"><a href=\"#phpt-reference-2\" aria-label=\"Reference 2\">[2]<\/a><\/sup><\/p>\n\n<h2 id=\"phpt-summary\">Summary: interpret the relationship, then assess its consequences<\/h2>\n<p><strong>Primary hyperparathyroidism testing is most useful when calcium and PTH are interpreted together.<\/strong> Vitamin D, kidney function, medications, and urinary calcium help distinguish competing explanations. Kidney imaging and bone-density assessment reveal consequences that blood tests alone cannot show. Serial results help determine whether the chosen management plan remains appropriate. <sup class=\"phpt-reference\"><a href=\"#phpt-reference-1\" aria-label=\"Reference 1\">[1]<\/a>, <a href=\"#phpt-reference-2\" aria-label=\"Reference 2\">[2]<\/a><\/sup><\/p>\n<p>Explore the linked laboratory options with your healthcare provider, select only the tests needed for the next clinical question, and use the results to guide follow-up\u2014not to substitute for it.<\/p>\n\n<h2 id=\"phpt-related-guides\">Related lab-testing and health guides<\/h2>\n<p><strong>Laboratory fundamentals:<\/strong> <a href=\"https:\/\/www.ultalabtests.com\/blog\/lab-testing-knowledge-center\/complete-guide-to-lab-tests-and-blood-work\/\">The Complete Guide to Lab Tests and Blood Work<\/a>; <a href=\"https:\/\/www.ultalabtests.com\/blog\/lab-testing-knowledge-center\/how-to-read-lab-results\/\">How to Read and Understand Your Lab Results<\/a>; <a href=\"https:\/\/www.ultalabtests.com\/blog\/lab-testing-knowledge-center\/direct-access-lab-testing\/\">Direct-Access Lab Testing: How It Works and What to Expect<\/a>.<\/p>\n<p><strong>Related health areas:<\/strong> <a href=\"https:\/\/www.ultalabtests.com\/blog\/kidney\/kidney-health\/kidney-function-tests\/\">Kidney Function Tests<\/a>; <a href=\"https:\/\/www.ultalabtests.com\/blog\/nutrition\/vitamin-nutrient-deficiency-tests\/\">Vitamin and Nutrient Deficiency Tests<\/a>; <a href=\"https:\/\/www.ultalabtests.com\/blog\/longevity-and-healthy-aging\/healthy-aging-longevity-blood-tests\/\">Healthy Aging and Longevity Blood Tests<\/a>. These broader guides complement the condition-specific evaluation above.<\/p>\n\n<h2 id=\"phpt-references\">References<\/h2>\n<p>The diagnostic definitions, surgical criteria, and monitoring intervals above identify the Fifth International Workshop\u2019s 2022 recommendations. The discussion of albumin-adjustment limitations also incorporates the separate 2025 study listed below.<\/p>\n<ol class=\"phpt-reference-list\">\n<li id=\"phpt-reference-1\">National Institute of Diabetes and Digestive and Kidney Diseases. <a href=\"https:\/\/www.niddk.nih.gov\/health-information\/endocrine-diseases\/primary-hyperparathyroidism\">Primary Hyperparathyroidism<\/a>. <\/li>\n<li id=\"phpt-reference-2\">Bilezikian JP, Khan AA, Silverberg SJ, et al.. <a href=\"https:\/\/academic.oup.com\/jbmr\/article\/37\/11\/2293\/7512381\">Evaluation and Management of Primary Hyperparathyroidism: Summary Statement and Guidelines from the Fifth International Workshop<\/a>. Journal of Bone and Mineral Research. 2022;37(11):2293\u20132314. doi:10.1002\/jbmr.4677.<\/li>\n<li id=\"phpt-reference-3\">Desgagn\u00e9s N, King JA, Kline GA, Seiden-Long I, Leung AA. <a href=\"https:\/\/jamanetwork.com\/journals\/jamanetworkopen\/fullarticle\/2829419\">Use of Albumin-Adjusted Calcium Measurements in Clinical Practice<\/a>. JAMA Network Open. 2025;8(1):e2455251. doi:10.1001\/jamanetworkopen.2024.55251.<\/li>\n<li id=\"phpt-reference-4\">MedlinePlus, U.S. National Library of Medicine. <a href=\"https:\/\/medlineplus.gov\/lab-tests\/calcium-blood-test\/\">Calcium Blood Test<\/a>. <\/li>\n<li id=\"phpt-reference-5\">MedlinePlus, U.S. National Library of Medicine. <a href=\"https:\/\/medlineplus.gov\/lab-tests\/parathyroid-hormone-pth-test\/\">Parathyroid Hormone (PTH) Test<\/a>. <\/li>\n<li id=\"phpt-reference-6\">MedlinePlus, U.S. National Library of Medicine. <a href=\"https:\/\/medlineplus.gov\/lab-tests\/calcium-in-urine-test\/\">Calcium in Urine Test<\/a>. <\/li>\n<li id=\"phpt-reference-7\">National Institute of Diabetes and Digestive and Kidney Diseases. <a href=\"https:\/\/www.niddk.nih.gov\/health-information\/digestive-diseases\/celiac-disease\/diagnosis\">Diagnosis of Celiac Disease<\/a>.<\/li>\n<li id=\"phpt-reference-8\">National Institute of Diabetes and Digestive and Kidney Diseases. <a href=\"https:\/\/www.niddk.nih.gov\/health-information\/urologic-diseases\/kidney-stones\/diagnosis\">Diagnosis of Kidney Stones<\/a>.<\/li>\n<\/ol>\n<p><em>Medical disclaimer: This content is for education and is not personal medical advice. Laboratory testing does not replace evaluation, diagnosis, or treatment by a qualified healthcare professional. Seek urgent care for severe or rapidly worsening symptoms.<\/em><\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Why calcium, PTH, vitamin D, kidney function, and urine calcium must be interpreted together. Primary hyperparathyroidism testing starts with a relationship: when blood calcium rises, parathyroid hormone (PTH) should fall. A PTH result that stays [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":2958,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":true,"om_disable_all_campaigns":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_post_was_ever_published":false},"categories":[59,60,156,233,283,61,164,282,294,207,243],"tags":[4844,2089,4832,1807,3723,4840,609,4822,4796,4828],"class_list":["post-2957","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-bone-joints","category-bone-and-joint","category-hormone","category-kidney-health","category-minerals","category-osteoporosis","category-parathyroid-diseases-pth","category-all-vitamin-and-minerals","category-vitamin-d-deficiency","category-vitamin-and-minerals","category-vitamins-and-minerals","tag-24-hour-urine-calcium-test-2","tag-calcium-blood-test","tag-familial-hypocalciuric-hypercalcemia","tag-hypercalcemia","tag-kidney-stones","tag-normocalcemic-primary-hyperparathyroidism","tag-osteoporosis","tag-primary-hyperparathyroidism","tag-pth-blood-test","tag-vitamin-d-and-pth"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v28.3 (Yoast SEO v28.4) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Primary Hyperparathyroidism: What High Calcium and PTH Reveal | Ulta Lab Tests<\/title>\n<meta name=\"description\" content=\"Learn how primary hyperparathyroidism testing connects high calcium and the PTH blood test with vitamin D, kidney function and urine calcium.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.ultalabtests.com\/blog\/hormone\/parathyroid-diseases-pth\/primary-hyperparathyroidism-high-calcium-pth-test\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Primary Hyperparathyroidism: What High Calcium and PTH Reveal\" \/>\n<meta property=\"og:description\" content=\"Learn how primary hyperparathyroidism testing connects high calcium and the PTH blood test with vitamin D, kidney function and urine calcium.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.ultalabtests.com\/blog\/hormone\/parathyroid-diseases-pth\/primary-hyperparathyroidism-high-calcium-pth-test\/\" \/>\n<meta property=\"og:site_name\" content=\"Ulta Lab Tests\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/facebook.com\/ultalabtests\" \/>\n<meta property=\"article:published_time\" content=\"2026-09-06T20:25:23+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-09-06T20:25:27+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.ultalabtests.com\/blog\/wp-content\/uploads\/2026\/07\/primary-hyperparathyroidism-high-calcium-pth-test-square-Large.jpeg\" \/>\n\t<meta property=\"og:image:width\" content=\"1254\" \/>\n\t<meta property=\"og:image:height\" content=\"1254\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"John R\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"John R\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"23 minutes\" \/>\n<!-- \/ Yoast SEO Premium plugin. -->","yoast_head_json":{"title":"Primary Hyperparathyroidism: What High Calcium and PTH Reveal | Ulta Lab Tests","description":"Learn how primary hyperparathyroidism testing connects high calcium and the PTH blood test with vitamin D, kidney function and urine calcium.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.ultalabtests.com\/blog\/hormone\/parathyroid-diseases-pth\/primary-hyperparathyroidism-high-calcium-pth-test\/","og_locale":"en_US","og_type":"article","og_title":"Primary Hyperparathyroidism: What High Calcium and PTH Reveal","og_description":"Learn how primary hyperparathyroidism testing connects high calcium and the PTH blood test with vitamin D, kidney function and urine calcium.","og_url":"https:\/\/www.ultalabtests.com\/blog\/hormone\/parathyroid-diseases-pth\/primary-hyperparathyroidism-high-calcium-pth-test\/","og_site_name":"Ulta Lab Tests","article_publisher":"https:\/\/facebook.com\/ultalabtests","article_published_time":"2026-09-06T20:25:23+00:00","article_modified_time":"2026-09-06T20:25:27+00:00","og_image":[{"width":1254,"height":1254,"url":"https:\/\/www.ultalabtests.com\/blog\/wp-content\/uploads\/2026\/07\/primary-hyperparathyroidism-high-calcium-pth-test-square-Large.jpeg","type":"image\/jpeg"}],"author":"John R","twitter_card":"summary_large_image","twitter_misc":{"Written by":"John R","Est. reading time":"23 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/www.ultalabtests.com\/blog\/hormone\/parathyroid-diseases-pth\/primary-hyperparathyroidism-high-calcium-pth-test\/#article","isPartOf":{"@id":"https:\/\/www.ultalabtests.com\/blog\/hormone\/parathyroid-diseases-pth\/primary-hyperparathyroidism-high-calcium-pth-test\/"},"author":{"name":"John R","@id":"https:\/\/www.ultalabtests.com\/blog\/#\/schema\/person\/e9af1f4fe34b68909911dc95c313ed6a"},"headline":"Primary Hyperparathyroidism: What High Calcium and PTH Reveal","datePublished":"2026-09-06T20:25:23+00:00","dateModified":"2026-09-06T20:25:27+00:00","mainEntityOfPage":{"@id":"https:\/\/www.ultalabtests.com\/blog\/hormone\/parathyroid-diseases-pth\/primary-hyperparathyroidism-high-calcium-pth-test\/"},"wordCount":4571,"commentCount":0,"publisher":{"@id":"https:\/\/www.ultalabtests.com\/blog\/#organization"},"image":{"@id":"https:\/\/www.ultalabtests.com\/blog\/hormone\/parathyroid-diseases-pth\/primary-hyperparathyroidism-high-calcium-pth-test\/#primaryimage"},"thumbnailUrl":"https:\/\/i0.wp.com\/www.ultalabtests.com\/blog\/wp-content\/uploads\/2026\/07\/primary-hyperparathyroidism-high-calcium-pth-test-square-Large.jpeg?fit=1254%2C1254&quality=100&ssl=1","keywords":["24 hour urine calcium test","calcium blood test","familial hypocalciuric hypercalcemia","hypercalcemia","kidney stones","normocalcemic primary hyperparathyroidism","Osteoporosis","primary hyperparathyroidism","PTH blood test","vitamin D and PTH"],"articleSection":["Bone &amp; Joints","Bone and Joint","Hormones","Kidney Health","Minerals","Osteoporosis","Parathyroid Diseases (PTH)","Vitamin and Minerals","Vitamin D Deficiency","Vitamins &amp; Minerals","Vitamins and Minerals"],"inLanguage":"en-US","potentialAction":[{"@type":"CommentAction","name":"Comment","target":["https:\/\/www.ultalabtests.com\/blog\/hormone\/parathyroid-diseases-pth\/primary-hyperparathyroidism-high-calcium-pth-test\/#respond"]}]},{"@type":"WebPage","@id":"https:\/\/www.ultalabtests.com\/blog\/hormone\/parathyroid-diseases-pth\/primary-hyperparathyroidism-high-calcium-pth-test\/","url":"https:\/\/www.ultalabtests.com\/blog\/hormone\/parathyroid-diseases-pth\/primary-hyperparathyroidism-high-calcium-pth-test\/","name":"Primary Hyperparathyroidism: What High Calcium and PTH Reveal | Ulta Lab Tests","isPartOf":{"@id":"https:\/\/www.ultalabtests.com\/blog\/#website"},"primaryImageOfPage":{"@id":"https:\/\/www.ultalabtests.com\/blog\/hormone\/parathyroid-diseases-pth\/primary-hyperparathyroidism-high-calcium-pth-test\/#primaryimage"},"image":{"@id":"https:\/\/www.ultalabtests.com\/blog\/hormone\/parathyroid-diseases-pth\/primary-hyperparathyroidism-high-calcium-pth-test\/#primaryimage"},"thumbnailUrl":"https:\/\/i0.wp.com\/www.ultalabtests.com\/blog\/wp-content\/uploads\/2026\/07\/primary-hyperparathyroidism-high-calcium-pth-test-square-Large.jpeg?fit=1254%2C1254&quality=100&ssl=1","datePublished":"2026-09-06T20:25:23+00:00","dateModified":"2026-09-06T20:25:27+00:00","description":"Learn how primary hyperparathyroidism testing connects high calcium and the PTH blood test with vitamin D, kidney function and urine calcium.","breadcrumb":{"@id":"https:\/\/www.ultalabtests.com\/blog\/hormone\/parathyroid-diseases-pth\/primary-hyperparathyroidism-high-calcium-pth-test\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.ultalabtests.com\/blog\/hormone\/parathyroid-diseases-pth\/primary-hyperparathyroidism-high-calcium-pth-test\/"]}]},{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/www.ultalabtests.com\/blog\/hormone\/parathyroid-diseases-pth\/primary-hyperparathyroidism-high-calcium-pth-test\/#primaryimage","url":"https:\/\/i0.wp.com\/www.ultalabtests.com\/blog\/wp-content\/uploads\/2026\/07\/primary-hyperparathyroidism-high-calcium-pth-test-square-Large.jpeg?fit=1254%2C1254&quality=100&ssl=1","contentUrl":"https:\/\/i0.wp.com\/www.ultalabtests.com\/blog\/wp-content\/uploads\/2026\/07\/primary-hyperparathyroidism-high-calcium-pth-test-square-Large.jpeg?fit=1254%2C1254&quality=100&ssl=1","width":1254,"height":1254,"caption":"High calcium may reveal a parathyroid hormone pattern. Measuring calcium and PTH together can help guide appropriate follow-up."},{"@type":"BreadcrumbList","@id":"https:\/\/www.ultalabtests.com\/blog\/hormone\/parathyroid-diseases-pth\/primary-hyperparathyroidism-high-calcium-pth-test\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Ulta Lab Tests","item":"https:\/\/www.ultalabtests.com\/blog\/"},{"@type":"ListItem","position":2,"name":"Hormones","item":"https:\/\/www.ultalabtests.com\/blog\/category\/hormone\/"},{"@type":"ListItem","position":3,"name":"Parathyroid Diseases (PTH)","item":"https:\/\/www.ultalabtests.com\/blog\/category\/hormone\/parathyroid-diseases-pth\/"},{"@type":"ListItem","position":4,"name":"Primary Hyperparathyroidism: What High Calcium and PTH Reveal"}]},{"@type":"WebSite","@id":"https:\/\/www.ultalabtests.com\/blog\/#website","url":"https:\/\/www.ultalabtests.com\/blog\/","name":"Ulta Lab Tests","description":"You Order the Test. We&#039;ll Do the Rest!","publisher":{"@id":"https:\/\/www.ultalabtests.com\/blog\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/www.ultalabtests.com\/blog\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"},{"@type":"Organization","@id":"https:\/\/www.ultalabtests.com\/blog\/#organization","name":"Ulta Lab Tests","url":"https:\/\/www.ultalabtests.com\/blog\/","logo":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/www.ultalabtests.com\/blog\/#\/schema\/logo\/image\/","url":"https:\/\/i0.wp.com\/www.ultalabtests.com\/blog\/wp-content\/uploads\/2023\/02\/logo.png?fit=405%2C79&ssl=1","contentUrl":"https:\/\/i0.wp.com\/www.ultalabtests.com\/blog\/wp-content\/uploads\/2023\/02\/logo.png?fit=405%2C79&ssl=1","width":405,"height":79,"caption":"Ulta Lab Tests"},"image":{"@id":"https:\/\/www.ultalabtests.com\/blog\/#\/schema\/logo\/image\/"},"sameAs":["https:\/\/facebook.com\/ultalabtests","http:\/\/www.linkedin.com\/company\/3335617"]},{"@type":"Person","@id":"https:\/\/www.ultalabtests.com\/blog\/#\/schema\/person\/e9af1f4fe34b68909911dc95c313ed6a","name":"John R","image":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/secure.gravatar.com\/avatar\/d48f9c8356694121fd9e2793e13d6aa6855e5df11f9b14f7a872b4ea554581fb?s=96&d=mm&r=g","url":"https:\/\/secure.gravatar.com\/avatar\/d48f9c8356694121fd9e2793e13d6aa6855e5df11f9b14f7a872b4ea554581fb?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/d48f9c8356694121fd9e2793e13d6aa6855e5df11f9b14f7a872b4ea554581fb?s=96&d=mm&r=g","caption":"John R"}}]}},"featured_image_src":"https:\/\/i0.wp.com\/www.ultalabtests.com\/blog\/wp-content\/uploads\/2026\/07\/primary-hyperparathyroidism-high-calcium-pth-test-square-Large.jpeg?resize=600%2C400&quality=100&ssl=1","featured_image_src_square":"https:\/\/i0.wp.com\/www.ultalabtests.com\/blog\/wp-content\/uploads\/2026\/07\/primary-hyperparathyroidism-high-calcium-pth-test-square-Large.jpeg?resize=600%2C600&quality=100&ssl=1","author_info":{"display_name":"John R","author_link":"https:\/\/www.ultalabtests.com\/blog\/author\/johnroehmultalabtests-com\/"},"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"https:\/\/i0.wp.com\/www.ultalabtests.com\/blog\/wp-content\/uploads\/2026\/07\/primary-hyperparathyroidism-high-calcium-pth-test-square-Large.jpeg?fit=1254%2C1254&quality=100&ssl=1","_links":{"self":[{"href":"https:\/\/www.ultalabtests.com\/blog\/wp-json\/wp\/v2\/posts\/2957","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.ultalabtests.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.ultalabtests.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.ultalabtests.com\/blog\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/www.ultalabtests.com\/blog\/wp-json\/wp\/v2\/comments?post=2957"}],"version-history":[{"count":0,"href":"https:\/\/www.ultalabtests.com\/blog\/wp-json\/wp\/v2\/posts\/2957\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.ultalabtests.com\/blog\/wp-json\/wp\/v2\/media\/2958"}],"wp:attachment":[{"href":"https:\/\/www.ultalabtests.com\/blog\/wp-json\/wp\/v2\/media?parent=2957"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ultalabtests.com\/blog\/wp-json\/wp\/v2\/categories?post=2957"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ultalabtests.com\/blog\/wp-json\/wp\/v2\/tags?post=2957"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}