{"id":3602,"date":"2026-08-25T07:53:43","date_gmt":"2026-08-25T14:53:43","guid":{"rendered":"https:\/\/www.ultalabtests.com\/blog\/?p=3602"},"modified":"2026-08-25T13:47:25","modified_gmt":"2026-08-25T20:47:25","slug":"primary-aldosteronism","status":"publish","type":"post","link":"https:\/\/www.ultalabtests.com\/blog\/heart-and-cardiovascular\/high-blood-pressure-hypertension\/primary-aldosteronism\/","title":{"rendered":"Primary Aldosteronism: When a Hormone Disorder Drives High Blood Pressure"},"content":{"rendered":"\n<figure class=\"wp-block-image is-resized\"><img data-recalc-dims=\"1\" decoding=\"async\" src=\"https:\/\/i0.wp.com\/www.ultalabtests.com\/blog\/wp-content\/uploads\/2026\/08\/primary-aldosteronism-hormone-high-blood-pressure.webp?quality=100&#038;ssl=1\" alt=\"Primary aldosteronism infographic showing excess adrenal aldosterone, kidney sodium and water retention, high blood pressure, and aldosterone, renin, and potassium testing.\" style=\"aspect-ratio:1.7777777777777777;width:1024px;height:auto\" title=\"Primary Aldosteronism: Hormone-Driven High Blood Pressure\"\/><figcaption class=\"wp-element-caption\">In primary aldosteronism, excess or inappropriately active aldosterone can cause the kidneys to retain sodium and water, suppress renin, and raise blood pressure.<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>High blood pressure is not always \u201cessential\u201d hypertension.<\/strong> In primary aldosteronism (PA), one or both adrenal glands produce aldosterone partly independently of the body\u2019s normal renin control system. The result can be sodium retention, suppressed renin, persistent or resistant hypertension, and\u2014sometimes, but not always\u2014low potassium.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>Direct answer:<\/strong> Primary aldosteronism screening is built around the relationship between aldosterone and renin, not potassium alone. A pattern of suppressed renin with aldosterone that is inappropriately active for that renin level\u2014usually assessed with an aldosterone-to-renin ratio (ARR)\u2014raises concern. Potassium, kidney function, medications, sodium intake, posture, collection time, assay method, units, and blood-pressure history all affect interpretation.<\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Medical note:<\/strong> Laboratory testing can identify a biochemical pattern that warrants evaluation, but it does not by itself determine whether PA is unilateral or bilateral, whether an adrenal nodule is the source, or whether surgery is appropriate. Medication changes, suppression testing, adrenal imaging, adrenal venous sampling, and treatment decisions should be clinician directed.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Part of the Ulta Lab Tests Knowledge Center<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">This condition-specific guide complements the <a href=\"https:\/\/www.ultalabtests.com\/blog\/heart-and-cardiovascular\/high-blood-pressure-hypertension\/hypertension-lab-tests\/\">Hypertension Lab Tests: What Blood and Urine Testing Can Reveal After a High Reading<\/a> hub.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For broader context, see <a href=\"https:\/\/www.ultalabtests.com\/blog\/heart-and-cardiovascular\/heart-health-blood-tests\/\">Heart Health Blood Tests<\/a>, <a href=\"https:\/\/www.ultalabtests.com\/blog\/kidney\/kidney-health\/kidney-function-tests\/\">Kidney Function Tests<\/a>, <a href=\"https:\/\/www.ultalabtests.com\/blog\/hormone\/endocrine\/endocrine-disorders-symptoms-causes-lab-tests\/\">Endocrine Disorders: Causes, Symptoms, Lab Tests, and Management<\/a>, and the <a href=\"https:\/\/www.ultalabtests.com\/blog\/general-health\/all-general-health\/blood-biomarker-ratios-guide\/\">Blood Biomarker Ratios Guide<\/a>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For testing fundamentals and result interpretation, use <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>, and <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\n\n\n<h2 class=\"wp-block-heading\">Key Takeaways<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Normal potassium does not rule out primary aldosteronism.<\/strong> Many affected people are not hypokalemic.<\/li>\n\n\n\n<li>The most useful screening pattern is <strong>aldosterone + renin + ARR<\/strong>, with <a href=\"https:\/\/www.ultalabtests.com\/test\/potassium-test\">potassium<\/a> measured at the same time.<\/li>\n\n\n\n<li>An aldosterone result that appears \u201cnormal\u201d can still be inappropriate when renin is strongly suppressed.<\/li>\n\n\n\n<li>ARR cutoffs depend on the renin method, aldosterone assay, units, laboratory, and clinical context; an internet cutoff should not be applied blindly.<\/li>\n\n\n\n<li>Low potassium can suppress aldosterone and create a falsely reassuring result.<\/li>\n\n\n\n<li>Blood-pressure medicines can push renin and aldosterone in different directions. <strong>Do not stop antihypertensive medication on your own to prepare for testing.<\/strong><\/li>\n\n\n\n<li>A suspicious negative screen may need to be repeated after a correctable confounder is addressed.<\/li>\n\n\n\n<li>A positive screening pattern does not reveal which adrenal gland is responsible.<\/li>\n\n\n\n<li>Suppression testing, imaging, and adrenal venous sampling answer different questions and should be clinician directed.<\/li>\n\n\n\n<li>After treatment, blood pressure, potassium, kidney function, and renin can become important monitoring markers.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Primary Aldosteronism at a Glance<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Question<\/th><th>What matters most<\/th><th>Why it changes the next step<\/th><\/tr><\/thead><tbody><tr><td><strong>Is aldosterone escaping normal renin control?<\/strong><\/td><td>Suppressed renin + aldosterone inappropriate for that renin level + elevated ARR<\/td><td>This is the central screening pattern for PA.<\/td><\/tr><tr><td><strong>Does potassium exclude PA?<\/strong><\/td><td>No. <a href=\"https:\/\/www.ultalabtests.com\/test\/potassium-test\">Potassium<\/a> may be normal.<\/td><td>Waiting for hypokalemia can miss cases; low potassium can also lower aldosterone and distort screening.<\/td><\/tr><tr><td><strong>Can one ARR diagnose PA?<\/strong><\/td><td>Not always. Assay, units, medicines, kidney function, sodium intake, posture, timing, and potassium matter.<\/td><td>Borderline or discordant results may require repeat testing or clinician-directed confirmation.<\/td><\/tr><tr><td><strong>Does CT show which gland is responsible?<\/strong><\/td><td>CT shows anatomy, not necessarily hormone production.<\/td><td>Adrenal venous sampling is often used to establish functional laterality before surgery.<\/td><\/tr><tr><td><strong>What is monitored after treatment?<\/strong><\/td><td><a href=\"https:\/\/www.ultalabtests.com\/test\/potassium-test\">Potassium<\/a>, <a href=\"https:\/\/www.ultalabtests.com\/test\/creatinine\">creatinine\/eGFR<\/a>, renin, and blood pressure<\/td><td>These markers help assess physiologic response and treatment safety.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">What Is Primary Aldosteronism?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Aldosterone is a mineralocorticoid hormone made by the adrenal cortex. It helps regulate sodium, potassium, circulating volume, and blood pressure. Under ordinary physiology, the kidneys participate in a renin\u2013angiotensin\u2013aldosterone system that increases aldosterone when the body needs to conserve sodium and maintain circulation.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In <strong>primary aldosteronism<\/strong>, aldosterone production becomes partly independent of that normal renin signal. Renin becomes suppressed while aldosterone remains inappropriately active. The kidney retains more sodium and may lose more potassium and hydrogen ions, contributing to hypertension, hypokalemia, or metabolic alkalosis in some patients.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The word <strong>primary<\/strong> is important. In secondary hyperaldosteronism, renin is usually activated first\u2014for example, when the kidney senses reduced effective circulation\u2014and aldosterone rises in response. PA is instead characterized by aldosterone production that is inappropriate for a suppressed-renin state.<\/p>\n\n\n\n<figure class=\"wp-block-image is-resized\"><img data-recalc-dims=\"1\" decoding=\"async\" src=\"https:\/\/i0.wp.com\/www.ultalabtests.com\/blog\/wp-content\/uploads\/2026\/08\/primary-aldosteronism-aldosterone-renin-kidney-pathway.webp?quality=100&#038;ssl=1\" alt=\"Flow diagram showing excess adrenal aldosterone causing kidney sodium retention, expanded blood volume, suppressed renin, possible potassium loss, and higher blood pressure.\" style=\"aspect-ratio:1.3333333333333333;width:1024px;height:auto\" title=\"How Primary Aldosteronism Develops\"\/><figcaption class=\"wp-element-caption\">Primary aldosteronism produces inappropriate aldosterone activity with suppressed renin; potassium loss may occur, but low potassium is not required.<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Why Primary Aldosteronism Matters Beyond the Blood Pressure Number<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">PA is clinically important because it is a potentially targetable cause of hypertension. Compared with people who have otherwise similar primary hypertension, untreated PA is associated with greater cardiovascular and kidney risk. Once the biochemical disorder is recognized, treatment can be directed at the underlying mechanism rather than only at the blood-pressure reading.<sup><a href=\"#ref-2\">2<\/a><\/sup><\/p>\n\n\n\n<figure class=\"wp-block-image is-resized\"><img data-recalc-dims=\"1\" decoding=\"async\" src=\"https:\/\/i0.wp.com\/www.ultalabtests.com\/blog\/wp-content\/uploads\/2026\/08\/primary-aldosteronism-vs-primary-hypertension.webp?quality=100&#038;ssl=1\" alt=\"Side-by-side chart comparing primary hypertension and primary aldosteronism by cause, renin and aldosterone pattern, potassium, ARR, and treatment approach.\" style=\"aspect-ratio:1.3333333333333333;width:1024px;height:auto\" title=\"Primary Aldosteronism vs. Primary Hypertension\"\/><figcaption class=\"wp-element-caption\">Unlike primary hypertension, primary aldosteronism has a specific adrenal hormone mechanism that may support targeted medical or surgical treatment.<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">The broader cardiovascular and kidney picture still matters. The <a href=\"https:\/\/www.ultalabtests.com\/blog\/heart-and-cardiovascular\/high-blood-pressure-hypertension\/hypertension-lab-tests\/\">hypertension lab testing hub<\/a> explains how <a href=\"https:\/\/www.ultalabtests.com\/test\/albumin-random-urine-test-with-creatinine\">urine albumin-to-creatinine ratio<\/a>, <a href=\"https:\/\/www.ultalabtests.com\/test\/creatinine\">creatinine\/eGFR<\/a>, glucose testing, lipid testing, and other markers help define organ effects and cardiometabolic risk without duplicating the disease-specific PA workup here.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Who Should Be Screened for Primary Aldosteronism?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The 2025 Endocrine Society guideline represents a major shift: it conditionally suggests screening all individuals with hypertension for PA when the health system has the resources, expertise, and follow-up capacity to do so.<sup><a href=\"#ref-1\">1<\/a><\/sup> This is a conditional suggestion rather than an instruction that every person must be screened in every setting.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Even where broad screening is not feasible, the case for testing is especially compelling when the clinical pattern includes:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Resistant hypertension or pressure that is becoming progressively harder to control<\/li>\n\n\n\n<li>Stage 2 hypertension<\/li>\n\n\n\n<li>Spontaneous or diuretic-associated hypokalemia<\/li>\n\n\n\n<li>Hypertension with obstructive sleep apnea<\/li>\n\n\n\n<li>An adrenal incidentaloma together with hypertension<\/li>\n\n\n\n<li>Hypertension beginning at a relatively young age<\/li>\n\n\n\n<li>A strong family history of early hypertension, known PA, or premature stroke<\/li>\n\n\n\n<li>Atrial fibrillation without a clear structural or thyroid explanation<\/li>\n\n\n\n<li>Hypertension requiring several medications<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">These features increase the pretest probability, but their absence does not rule PA out.<\/p>\n\n\n\n<figure class=\"wp-block-image is-resized\"><img data-recalc-dims=\"1\" decoding=\"async\" src=\"https:\/\/i0.wp.com\/www.ultalabtests.com\/blog\/wp-content\/uploads\/2026\/08\/primary-aldosteronism-screening-high-blood-pressure.webp?quality=100&#038;ssl=1\" alt=\"Primary aldosteronism screening infographic highlighting resistant or stage 2 hypertension, low potassium, sleep apnea, adrenal nodule, young onset, atrial fibrillation, and family history.\" style=\"aspect-ratio:1.3333333333333333;width:1024px;height:auto\" title=\"Who Should Be Screened for Primary Aldosteronism?\"\/><figcaption class=\"wp-element-caption\">Current guidance suggests PA screening in people with hypertension where feasible, with particular attention when hypertension is resistant, severe, early, or accompanied by specific clinical clues.<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">The Key Screening Pattern: Aldosterone + Renin + ARR<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">An isolated aldosterone value is difficult to interpret. A result can fall inside a laboratory reference interval yet still be inappropriate when renin is nearly completely suppressed. Conversely, aldosterone may be elevated in circumstances where renin is also appropriately elevated.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The screening question is therefore relational:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>Is aldosterone inappropriately active despite suppressed renin?<\/strong><\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\">The most direct Ulta option is the <a href=\"https:\/\/www.ultalabtests.com\/test\/aldosterone-and-plasma-renin-activity-ratio-test\">Aldosterone and Plasma Renin Activity Ratio Test<\/a>. Individual <a href=\"https:\/\/www.ultalabtests.com\/test\/aldosterone-test\">Aldosterone<\/a> and <a href=\"https:\/\/www.ultalabtests.com\/test\/plasma-renin-activity-lc-ms-ms\">Plasma Renin Activity<\/a> tests may also be used when clinically appropriate, but interpretation should preserve the relationship between the two measurements.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Do not use the ratio alone.<\/strong> A very high ARR can result from renin approaching zero even when aldosterone is not convincingly elevated. Clinicians review the ARR together with the absolute aldosterone and renin values, the assay, the units, potassium, medications, kidney function, and the clinical probability of PA.<\/p>\n\n\n\n<figure class=\"wp-block-image is-resized\"><img data-recalc-dims=\"1\" decoding=\"async\" src=\"https:\/\/i0.wp.com\/www.ultalabtests.com\/blog\/wp-content\/uploads\/2026\/08\/aldosterone-renin-ratio-primary-aldosteronism-screening.webp?quality=100&#038;ssl=1\" alt=\"Aldosterone, renin, and ARR screening diagram showing suppressed renin, inappropriate aldosterone, and interpretation factors including potassium, medications, kidney function, sodium intake, timing, and assay.\" style=\"aspect-ratio:1.3333333333333333;width:1024px;height:auto\" title=\"Aldosterone, Renin, and ARR Screening for Primary Aldosteronism\"\/><figcaption class=\"wp-element-caption\">Suppressed renin, aldosterone that is inappropriate for the physiologic setting, and an elevated ARR can raise concern for primary aldosteronism.<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">How to Understand ARR Thresholds Without Treating Them as Universal Cutoffs<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The 2025 guideline provides practical guidance for commonly used assays. In its framework, a positive screen generally requires suppressed renin, aldosterone that is sufficiently high for the assay and physiologic context, and an elevated aldosterone-to-renin relationship.<sup><a href=\"#ref-1\">1<\/a><\/sup><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Examples include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Plasma renin activity at or below approximately <strong>1 ng\/mL\/hour<\/strong>, or direct renin concentration at or below approximately <strong>8.2 mU\/L<\/strong><\/li>\n\n\n\n<li>Aldosterone at least approximately <strong>10 ng\/dL by immunoassay<\/strong>, or approximately <strong>7.5 ng\/dL by LC-MS\/MS<\/strong><\/li>\n\n\n\n<li>An aldosterone-to-PRA ratio generally above <strong>20<\/strong> when aldosterone is expressed in ng\/dL and PRA in ng\/mL\/hour<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">These are <strong>guidance thresholds, not universal biological dividing lines<\/strong>. Laboratories may use different assays, units, reference information, and validated cutoffs. Interpretation should use the method and reference information on the actual laboratory report.<sup><a href=\"#ref-1\">1<\/a><\/sup><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Why PRA vs. Direct Renin and Immunoassay vs. LC-MS\/MS Matter<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Plasma renin activity and direct renin concentration are different measurements and are not numerically interchangeable. Aldosterone measured by immunoassay and aldosterone measured by liquid chromatography\u2013tandem mass spectrometry can also produce systematically different values. In the 2025 guideline framework, the ARR threshold associated with LC-MS\/MS aldosterone is approximately 25% lower than the immunoassay threshold.<sup><a href=\"#ref-2\">2<\/a><\/sup><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Practical rule:<\/strong> Never copy an ARR cutoff from an online chart without first knowing how aldosterone and renin were measured and which units appear on the report.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Why Normal Potassium Does Not Rule Out Primary Aldosteronism<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The older stereotype of PA was \u201chigh blood pressure plus low potassium.\u201d That misses many patients. Most people with PA do not need to be hypokalemic for the condition to be present.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/www.ultalabtests.com\/test\/potassium-test\">Potassium<\/a> still matters for two reasons:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Low potassium can be a consequence of aldosterone excess.<\/li>\n\n\n\n<li>Hypokalemia can itself suppress aldosterone secretion enough to make an initial screen look less abnormal than it should.<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">When suspicion remains high and potassium is low, correction into the laboratory reference range and repeat aldosterone-renin testing may be appropriate under clinician guidance.<sup><a href=\"#ref-1\">1<\/a><\/sup><\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>Direct answer:<\/strong> Normal potassium does not exclude PA. Low potassium can paradoxically make aldosterone look falsely low, so potassium is both a clinical clue and an interpretation variable.<\/p>\n<\/blockquote>\n\n\n\n<figure class=\"wp-block-image is-resized\"><img data-recalc-dims=\"1\" decoding=\"async\" src=\"https:\/\/i0.wp.com\/www.ultalabtests.com\/blog\/wp-content\/uploads\/2026\/08\/normal-potassium-primary-aldosteronism.webp?quality=100&#038;ssl=1\" alt=\"Comparison showing primary aldosteronism can occur with normal or low potassium when high blood pressure, suppressed renin, and inappropriate aldosterone are present.\" style=\"aspect-ratio:1.3333333333333333;width:1024px;height:auto\" title=\"Normal Potassium Does Not Rule Out Primary Aldosteronism\"\/><figcaption class=\"wp-element-caption\">Primary aldosteronism can occur with normal or low potassium, and hypokalemia may make aldosterone appear less abnormal during screening.<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Primary Aldosteronism Lab Tests: What to Order and What Each Adds<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The highest-value starting set is intentionally focused. Broader diabetes, lipid, thyroid, anemia, or autoimmune testing belongs in a general hypertension or symptom-directed evaluation rather than being presented as if it confirms PA.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Test and quick facts<\/th><th>What it shows and how it is used<\/th><th>Preparation, influences, and limitations<\/th><\/tr><\/thead><tbody><tr><td><strong>CORE<\/strong><br><a href=\"https:\/\/www.ultalabtests.com\/test\/aldosterone-and-plasma-renin-activity-ratio-test\">Aldosterone and Plasma Renin Activity Ratio Test<\/a><br><em>Blood<\/em><\/td><td>Measures aldosterone and plasma renin activity and calculates the ARR. Helps identify a suppressed-renin\/inappropriate-aldosterone screening pattern.<\/td><td>Strongly affected by medication classes, potassium, sodium intake, posture, collection time, kidney function, and assay method. A positive screen does not establish unilateral disease.<\/td><\/tr><tr><td><strong>CORE<\/strong><br><a href=\"https:\/\/www.ultalabtests.com\/test\/aldosterone-test\">Aldosterone Test<\/a><br><em>Blood<\/em><\/td><td>Measures circulating aldosterone. The value is most meaningful when interpreted with renin rather than alone.<\/td><td>Assay method and collection conditions matter. Hypokalemia can lower aldosterone and cause a misleading result.<\/td><\/tr><tr><td><strong>CORE<\/strong><br><a href=\"https:\/\/www.ultalabtests.com\/test\/plasma-renin-activity-lc-ms-ms\">Plasma Renin Activity Test<\/a><br><em>Blood<\/em><\/td><td>Shows renin activity. Marked renin suppression is central to the PA pattern and can later become a treatment-response marker.<\/td><td>Diuretics, MRAs, ACE inhibitors, ARBs, beta blockers, central alpha-2 agonists, sodium intake, kidney disease, and posture can shift renin substantially.<\/td><\/tr><tr><td><strong>CORE<\/strong><br><a href=\"https:\/\/www.ultalabtests.com\/test\/potassium-test\">Potassium Test<\/a><br><em>Blood<\/em><\/td><td>Identifies hypokalemia or hyperkalemia, supports aldosterone interpretation, and helps assess treatment safety.<\/td><td>Normal potassium does not exclude PA. Low potassium may suppress aldosterone. Supplements and medication changes should be clinician directed.<\/td><\/tr><tr><td><strong>SUPPORTING<\/strong><br><a href=\"https:\/\/www.ultalabtests.com\/test\/comprehensive-metabolic-panel-test-cmp\">Comprehensive Metabolic Panel<\/a> or <a href=\"https:\/\/www.ultalabtests.com\/test\/basic-metabolic-panel-bmp\">Basic Metabolic Panel<\/a><br><em>Blood<\/em><\/td><td>Adds sodium, potassium, carbon dioxide\/bicarbonate, creatinine, glucose, and other kidney and electrolyte context.<\/td><td>Does not diagnose PA. Serum sodium is not a measurement of dietary sodium intake.<\/td><\/tr><tr><td><strong>SUPPORTING<\/strong><br><a href=\"https:\/\/www.ultalabtests.com\/test\/creatinine\">Creatinine with eGFR<\/a><br><em>Blood<\/em><\/td><td>Estimates kidney filtration. Kidney function affects screening interpretation and becomes central to treatment safety.<\/td><td>CKD can alter renin and aldosterone physiology. Creatinine is also influenced by muscle mass, acute illness, hydration, and some medicines.<\/td><\/tr><tr><td><strong>SUPPORTING<\/strong><br><a href=\"https:\/\/www.ultalabtests.com\/test\/sodium-test\">Sodium Test<\/a><br><em>Blood<\/em><\/td><td>Adds electrolyte context and may be included in a metabolic panel.<\/td><td>Serum sodium does not show how much salt a person eats. Intentional sodium restriction before PA screening can alter renin-aldosterone physiology.<\/td><\/tr><tr><td><strong>SUPPORTING<\/strong><br><a href=\"https:\/\/www.ultalabtests.com\/test\/magnesium-test\">Magnesium Test<\/a><br><em>Blood<\/em><\/td><td>May be useful when cramps, arrhythmia, diuretic use, or multiple electrolyte abnormalities are present.<\/td><td>Not a PA screening test and should not be interpreted as evidence for or against PA.<\/td><\/tr><tr><td><strong>SUPPORTING CARDIORENAL<\/strong><br><a href=\"https:\/\/www.ultalabtests.com\/test\/albumin-random-urine-test-with-creatinine\">Urine Albumin-to-Creatinine Ratio<\/a><br><em>Urine<\/em><\/td><td>Assesses albumin leakage and kidney\/cardiovascular risk in a person with hypertension.<\/td><td>Does not diagnose PA. Temporary illness, exercise, infection, urinary bleeding, or menstrual bleeding can raise UACR.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">How to Prepare for Aldosterone and Renin Testing<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Collection conditions matter because the renin-aldosterone system responds quickly to volume, sodium, potassium, posture, and medication effects. Current guidance favors morning screening with the person seated, potassium measured at the same time, and no deliberate dietary sodium restriction during the preceding few days.<sup><a href=\"#ref-1\">1<\/a><\/sup><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Follow the specific collection instructions.<\/strong> Timing and posture should match the laboratory protocol.<\/li>\n\n\n\n<li><strong>Do not intentionally restrict sodium solely to \u201cimprove\u201d the test.<\/strong> Sodium restriction can stimulate renin and change the screening pattern.<\/li>\n\n\n\n<li><strong>Know the potassium result.<\/strong> If potassium is low, the screen may underestimate aldosterone.<\/li>\n\n\n\n<li><strong>Record all blood-pressure medicines and doses.<\/strong> Include recent changes.<\/li>\n\n\n\n<li><strong>Do not salt-load, potassium-load, or stop medications independently.<\/strong> Diagnostic accuracy must be balanced against blood-pressure, electrolyte, and kidney safety.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Medications Can Change the Aldosterone-to-Renin Ratio<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Modern PA evaluation recognizes that medication withdrawal is not always safe or practical. The Endocrine Society provides no-withdrawal, minimal-withdrawal, and fuller-withdrawal strategies that clinicians can choose based on safety and the probability of disease.<sup><a href=\"#ref-1\">1<\/a><\/sup><\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Medication pattern<\/th><th>Possible effect on screening<\/th><th>What the patient should do<\/th><\/tr><\/thead><tbody><tr><td>Mineralocorticoid receptor antagonists, amiloride, triamterene, and other diuretics<\/td><td>Can raise renin and make a PA pattern less obvious, creating a possible false-negative-looking result.<\/td><td>Do not stop independently. Record the drug and dose and review the result with the clinician who manages blood pressure.<\/td><\/tr><tr><td>ACE inhibitors and ARBs<\/td><td>Can raise renin and\/or lower aldosterone, potentially reducing the ARR.<\/td><td>Do not change therapy solely for a direct-access test without clinician guidance.<\/td><\/tr><tr><td>Beta blockers and centrally acting alpha-2 agonists<\/td><td>Can suppress renin and make the ARR appear higher, creating a possible false-positive-looking pattern.<\/td><td>Interpret aldosterone, renin, and ARR in the context of medication exposure.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">The practical takeaway is not \u201cstop the interfering drug.\u201d It is:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>Know the medication pattern before interpreting the laboratory pattern.<\/strong><\/p>\n<\/blockquote>\n\n\n\n<figure class=\"wp-block-image is-resized\"><img data-recalc-dims=\"1\" decoding=\"async\" src=\"https:\/\/i0.wp.com\/www.ultalabtests.com\/blog\/wp-content\/uploads\/2026\/08\/medications-aldosterone-renin-ratio-interference.webp?quality=100&#038;ssl=1\" alt=\"Medication chart showing how MRAs, diuretics, ACE inhibitors, ARBs, beta blockers, and central alpha-2 agonists can alter renin and ARR results.\" style=\"aspect-ratio:1.3333333333333333;width:1024px;height:auto\" title=\"How Medications Can Alter the Aldosterone-to-Renin Ratio\"\/><figcaption class=\"wp-element-caption\">Blood-pressure medications can shift renin and the apparent ARR toward false-negative- or false-positive-looking patterns; medication changes must be clinician directed.<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">How to Understand a Positive, Negative, or Borderline PA Screen<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Positive-Looking Pattern<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Suppressed renin together with aldosterone that is inappropriately high and an elevated ARR supports renin-independent aldosterone secretion. The strength of that conclusion depends on the assay, units, potassium, medications, kidney function, and clinical probability.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Negative-Looking Pattern<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A negative screen is more reassuring when potassium is normal, preparation was appropriate, the medication pattern does not strongly favor a false negative, and pretest probability is low. It is less reassuring when resistant hypertension, hypokalemia, or a strongly interfering medication is present.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Borderline or Discordant Pattern<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Examples include suppressed renin with aldosterone near the laboratory decision range, an elevated ARR driven almost entirely by extremely low renin, or a negative ratio while taking a medicine known to raise renin. These situations often call for clinical review rather than a simple yes\/no interpretation from one calculation.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">When Repeat Testing May Be Appropriate<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A single negative ARR does not always end the evaluation. Repeat aldosterone-renin testing may be reasonable when:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Hypokalemia was present during the first test<\/li>\n\n\n\n<li>A medication pattern could have produced a false negative<\/li>\n\n\n\n<li>Resistant hypertension or another strong clinical feature creates substantial pretest probability<\/li>\n\n\n\n<li>Renin is suppressed but aldosterone falls into a borderline range<\/li>\n\n\n\n<li>Collection conditions were not standardized<\/li>\n\n\n\n<li>Clinical suspicion remains high despite the first result<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">A useful sequence is:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Identify the possible confounder \u2192 correct or account for it safely \u2192 repeat under better-defined conditions \u2192 compare the full aldosterone-renin pattern.<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-image is-resized\"><img data-recalc-dims=\"1\" decoding=\"async\" src=\"https:\/\/i0.wp.com\/www.ultalabtests.com\/blog\/wp-content\/uploads\/2026\/08\/primary-aldosteronism-testing-pathway.webp?quality=100&#038;ssl=1\" alt=\"Primary aldosteronism testing flowchart from hypertension screening through aldosterone, renin, ARR, potassium, repeat testing, CT, AVS, treatment, and monitoring.\" style=\"aspect-ratio:0.7998046875;width:819px;height:auto\" title=\"Primary Aldosteronism Testing and Evaluation Pathway\"\/><figcaption class=\"wp-element-caption\">The PA pathway moves from biochemical screening and repeat testing when results are confounded to subtype evaluation, targeted treatment, and long-term monitoring.<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">What Happens After a Positive Primary Aldosteronism Screen?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Screening is only the first layer. The next question is whether the evidence is strong enough to proceed directly to subtype and treatment planning or whether a clinician-directed aldosterone-suppression test would clarify the diagnosis.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Suppression Testing Is Clinician Directed<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Examples include saline suppression, oral sodium suppression, and the captopril challenge. These procedures have defined protocols and safety restrictions. Salt-loading or saline-suppression experiments should not be attempted independently, particularly in people with uncontrolled hypertension, heart failure, substantial kidney disease, or risk of fluid overload.<sup><a href=\"#ref-2\">2<\/a><\/sup><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Under the 2025 guideline, suppression testing is not automatically required after every positive ARR. It is most useful when the probability of lateralizing PA remains intermediate and the patient is considering surgery. It may be bypassed when the biochemical evidence is very strong or when the person will pursue PA-specific medical treatment rather than surgery.<sup><a href=\"#ref-1\">1<\/a><\/sup><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">One example of overt biochemical evidence described by the guideline is resistant hypertension or hypertension with hypokalemia together with:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>PRA below <strong>0.2 ng\/mL\/hour<\/strong>, or direct renin below <strong>2 mU\/L<\/strong><\/li>\n\n\n\n<li>Aldosterone above <strong>20 ng\/dL by immunoassay<\/strong>, or above <strong>15 ng\/dL by LC-MS\/MS<\/strong><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">These values are not stand-alone self-diagnostic cutoffs. They are part of a clinician-directed decision about whether suppression testing adds useful information.<sup><a href=\"#ref-1\">1<\/a><\/sup><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Unilateral vs. Bilateral PA: Why CT and Adrenal Venous Sampling Answer Different Questions<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">After PA is established, treatment depends heavily on whether aldosterone excess comes predominantly from one adrenal gland or from both.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Unilateral\/lateralizing PA:<\/strong> A surgically suitable patient may be considered for unilateral adrenalectomy.<\/li>\n\n\n\n<li><strong>Bilateral PA or nonsurgical management:<\/strong> Treatment is generally medical with a mineralocorticoid receptor antagonist.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Adrenal CT identifies anatomy, but a visible nodule is not automatically the aldosterone-producing source. Nonfunctioning adrenal nodules become more common with age. For patients considering surgery, adrenal venous sampling is generally used with CT to establish functional laterality.<sup><a href=\"#ref-1\">1<\/a><\/sup><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A limited exception may apply to a younger patient\u2014roughly under age 35\u2014with marked PA, hypokalemia, and a clear unilateral adrenal adenoma larger than 1 cm, after specialist review. This is not a rule for self-selection; it is an expert-level decision.<sup><a href=\"#ref-1\">1<\/a><\/sup><\/p>\n\n\n\n<figure class=\"wp-block-image is-resized\"><img data-recalc-dims=\"1\" decoding=\"async\" src=\"https:\/\/i0.wp.com\/www.ultalabtests.com\/blog\/wp-content\/uploads\/2026\/08\/unilateral-bilateral-primary-aldosteronism-ct-avs.webp?quality=100&#038;ssl=1\" alt=\"Unilateral versus bilateral primary aldosteronism diagram showing CT anatomy, adrenal venous sampling for functional laterality, adrenalectomy, and medical treatment.\" style=\"aspect-ratio:1.3333333333333333;width:1024px;height:auto\" title=\"Unilateral vs. Bilateral Primary Aldosteronism: CT and AVS\"\/><figcaption class=\"wp-element-caption\">CT shows adrenal anatomy, while adrenal venous sampling helps determine whether aldosterone excess is functionally lateralized to one gland or arises from both.<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">When an Adrenal Adenoma Is Present, Cortisol May Need to Be Evaluated Too<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Some adrenal adenomas can participate in more than one hormonal abnormality. The 2025 guideline suggests a <strong>1-mg overnight dexamethasone suppression test<\/strong> when PA coexists with an adrenal adenoma.<sup><a href=\"#ref-1\">1<\/a><\/sup><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In the guideline protocol, dexamethasone is taken late at night and serum cortisol is measured the next morning. A post-dexamethasone cortisol above <strong>1.8 \u00b5g\/dL<\/strong> suggests autonomous cortisol secretion and warrants further endocrine evaluation.<sup><a href=\"#ref-1\">1<\/a><\/sup><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A stand-alone <a href=\"https:\/\/www.ultalabtests.com\/test\/cortisol-total-test\">Cortisol Total Test<\/a> is <strong>not equivalent<\/strong> to a clinician-directed dexamethasone suppression protocol. Medication timing, cortisol timing, and interpretation are part of the protocol.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Monitoring After Surgery or Mineralocorticoid Receptor Antagonist Therapy<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">After Unilateral Adrenalectomy<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Follow-up commonly centers on <a href=\"https:\/\/www.ultalabtests.com\/test\/potassium-test\">potassium<\/a>, <a href=\"https:\/\/www.ultalabtests.com\/test\/creatinine\">creatinine\/eGFR<\/a>, blood pressure, medication requirements, and\u2014when clinically appropriate\u2014aldosterone and renin. The goal is correction of the renin-independent aldosterone state and its physiological consequences, not simply removal of a nodule.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">During MRA Therapy<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">For bilateral PA, uncertain laterality, or nonsurgical care, a mineralocorticoid receptor antagonist such as spironolactone or a more selective alternative may be used under medical supervision. Monitoring includes potassium, kidney function, renin, and blood pressure.<sup><a href=\"#ref-1\">1<\/a><\/sup><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Why Renin Can Become a Treatment Marker<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Untreated PA usually suppresses renin. With adequate mineralocorticoid receptor blockade, renin often rises. In patients whose hypertension remains uncontrolled and whose renin remains suppressed, current guidance suggests clinician-directed intensification of PA-specific therapy to produce a rise in renin when potassium, kidney function, and blood pressure allow. The guideline does not specify one universal numerical renin target.<sup><a href=\"#ref-1\">1<\/a><\/sup><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A useful treatment-response pattern is:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Blood pressure improving + potassium safe + renin no longer fully suppressed + kidney function stable.<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-image is-resized\"><img data-recalc-dims=\"1\" decoding=\"async\" src=\"https:\/\/i0.wp.com\/www.ultalabtests.com\/blog\/wp-content\/uploads\/2026\/08\/primary-aldosteronism-treatment-monitoring.webp?quality=100&#038;ssl=1\" alt=\"Primary aldosteronism treatment monitoring diagram showing blood pressure, potassium, renin, creatinine, and eGFR after surgery or mineralocorticoid receptor antagonist therapy.\" style=\"aspect-ratio:1.3333333333333333;width:1024px;height:auto\" title=\"Primary Aldosteronism Treatment and Monitoring\"\/><figcaption class=\"wp-element-caption\">Follow-up after adrenalectomy or MRA therapy tracks blood pressure, potassium, renin, and kidney function to assess treatment response and safety.<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Common Primary Aldosteronism Lab Patterns<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Hypertension + low potassium + suppressed renin + elevated aldosterone\/ARR:<\/strong> Strongly supports renin-independent aldosterone production. Potassium still needs correction because hypokalemia can distort repeat testing.<\/li>\n\n\n\n<li><strong>Resistant hypertension + normal potassium + suppressed renin + elevated ARR:<\/strong> Normal potassium does not rule PA out.<\/li>\n\n\n\n<li><strong>Suppressed renin + modest aldosterone while taking a beta blocker:<\/strong> Possible false-positive-looking ARR because renin may be medication-suppressed.<\/li>\n\n\n\n<li><strong>Resistant hypertension + negative ARR while taking an MRA:<\/strong> Possible false-negative-looking result because renin may rise on therapy.<\/li>\n\n\n\n<li><strong>Low renin + borderline aldosterone + CKD:<\/strong> Interpretation can be more difficult because kidney disease alters renin and aldosterone physiology.<\/li>\n\n\n\n<li><strong>Confirmed PA + unilateral adrenal nodule on CT:<\/strong> Anatomy alone usually does not prove the nodule is the functional source; AVS may be needed before surgery.<\/li>\n\n\n\n<li><strong>MRA therapy + rising potassium + falling eGFR:<\/strong> Treatment safety takes priority and requires prompt clinician review.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Testing Cautions and Common Mistakes<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Do not use potassium as the screening test.<\/strong> Most PA is not identified by waiting for hypokalemia.<\/li>\n\n\n\n<li><strong>Do not interpret aldosterone without renin.<\/strong> The relationship is the point.<\/li>\n\n\n\n<li><strong>Do not interpret ARR without knowing the assay and units.<\/strong> PRA and direct renin are not interchangeable.<\/li>\n\n\n\n<li><strong>Do not deliberately restrict sodium before routine screening unless instructed.<\/strong><\/li>\n\n\n\n<li><strong>Do not stop blood-pressure medication on your own.<\/strong><\/li>\n\n\n\n<li><strong>Do not assume one negative ARR permanently excludes PA.<\/strong> Confounding conditions can matter.<\/li>\n\n\n\n<li><strong>Do not assume one positive ARR proves unilateral disease.<\/strong><\/li>\n\n\n\n<li><strong>Do not assume an adrenal nodule is the source.<\/strong><\/li>\n\n\n\n<li><strong>Do not perform salt-loading or saline-suppression protocols independently.<\/strong><\/li>\n\n\n\n<li><strong>Do not increase an MRA dose on your own because renin remains low.<\/strong> Potassium, kidney function, and blood pressure must be monitored together.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">When Prompt Medical Evaluation Is Needed<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Direct-access testing is not an emergency pathway. Prompt or urgent medical evaluation is appropriate for:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Very high blood pressure with chest pain, severe shortness of breath, new neurologic symptoms, confusion, or visual change<\/li>\n\n\n\n<li>Severe hypokalemia<\/li>\n\n\n\n<li>Palpitations, fainting, or a significant arrhythmia together with an electrolyte abnormality<\/li>\n\n\n\n<li>Marked muscle weakness with low potassium<\/li>\n\n\n\n<li>Rapid worsening of kidney function<\/li>\n\n\n\n<li>Significant hyperkalemia after starting or increasing an MRA<\/li>\n\n\n\n<li>Resistant hypertension accompanied by rapidly progressive organ injury<\/li>\n\n\n\n<li>An adrenal mass with substantial hormonal abnormalities<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">A blood-pressure reading above 180\/120 mm Hg together with new chest pain, shortness of breath, weakness, numbness, vision change, difficulty speaking, or another concerning symptom requires emergency assessment.<sup><a href=\"#ref-4\">4<\/a><\/sup><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">How Ulta Lab Tests Can Help<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Ulta Lab Tests offers direct access, where available, to focused testing that can make the PA biochemical pattern visible. The <a href=\"https:\/\/www.ultalabtests.com\/test\/aldosterone-and-plasma-renin-activity-ratio-test\">Aldosterone and Plasma Renin Activity Ratio Test<\/a> is the most directly aligned single order.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Individual <a href=\"https:\/\/www.ultalabtests.com\/test\/aldosterone-test\">Aldosterone<\/a>, <a href=\"https:\/\/www.ultalabtests.com\/test\/plasma-renin-activity-lc-ms-ms\">Plasma Renin Activity<\/a>, <a href=\"https:\/\/www.ultalabtests.com\/test\/potassium-test\">Potassium<\/a>, <a href=\"https:\/\/www.ultalabtests.com\/test\/comprehensive-metabolic-panel-test-cmp\">Comprehensive Metabolic Panel<\/a>, <a href=\"https:\/\/www.ultalabtests.com\/test\/creatinine\">Creatinine with eGFR<\/a>, and <a href=\"https:\/\/www.ultalabtests.com\/test\/albumin-random-urine-test-with-creatinine\">Urine Albumin-to-Creatinine Ratio<\/a> tests can add specific context when clinically appropriate.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Direct access does not turn screening into a complete diagnosis. A qualified healthcare professional\u2014often a primary-care clinician, hypertension specialist, endocrinologist, nephrologist, or adrenal specialist\u2014should interpret a positive, negative, or discordant pattern in the context of medications, kidney function, collection conditions, and treatment goals.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/www.ultalabtests.com\/testing\/categories\/heart-and-cardiovascular\/high-blood-pressure\"><strong>Explore high blood pressure testing options at Ulta Lab Tests<\/strong><\/a> or review <a href=\"https:\/\/www.ultalabtests.com\/testing\/categories\/hormone\"><strong>hormone testing options<\/strong><\/a>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Recommended Lab Tests Discussed in This Article<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The appropriate test selection depends on the individual\u2019s blood-pressure pattern, medications, potassium level, kidney function, symptoms, previous results, and healthcare-provider guidance.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Core Primary Aldosteronism Screening<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Aldosterone and renin are interpreted together, usually through the aldosterone-to-renin ratio. Potassium is measured at the same time because low potassium can make aldosterone appear falsely low.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/www.ultalabtests.com\/test\/aldosterone-and-plasma-renin-activity-ratio-test\">Aldosterone and Plasma Renin Activity Ratio Test<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.ultalabtests.com\/test\/aldosterone-test\">Aldosterone Test<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.ultalabtests.com\/test\/plasma-renin-activity-lc-ms-ms\">Plasma Renin Activity Test<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.ultalabtests.com\/test\/potassium-test\">Potassium Test<\/a><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Kidney Function and Electrolyte Context<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">CMP or BMP, creatinine with eGFR, sodium, potassium, and magnesium provide kidney, electrolyte, and treatment-safety context. These tests do not diagnose primary aldosteronism by themselves.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/www.ultalabtests.com\/test\/comprehensive-metabolic-panel-test-cmp\">Comprehensive Metabolic Panel<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.ultalabtests.com\/test\/basic-metabolic-panel-bmp\">Basic Metabolic Panel<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.ultalabtests.com\/test\/creatinine\">Creatinine with eGFR<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.ultalabtests.com\/test\/sodium-test\">Sodium Test<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.ultalabtests.com\/test\/magnesium-test\">Magnesium Test<\/a><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Kidney Damage and Cardiorenal Risk<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">UACR evaluates albumin leakage and cardiorenal risk in people with hypertension. It provides useful health context but does not diagnose primary aldosteronism.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/www.ultalabtests.com\/test\/albumin-random-urine-test-with-creatinine\">Albumin, Random Urine with Creatinine \u2014 UACR<\/a><\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Adrenal and Cortisol Evaluation<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">When primary aldosteronism coexists with an adrenal adenoma, a clinician may recommend a formal 1-mg overnight dexamethasone suppression test. A stand-alone cortisol measurement is not equivalent to that protocol.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/www.ultalabtests.com\/test\/cortisol-total-test\">Cortisol Total Test<\/a><\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Related Health Resources<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/www.ultalabtests.com\/testing\/categories\/heart-and-cardiovascular\/high-blood-pressure\">High Blood Pressure Tests<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.ultalabtests.com\/testing\/categories\/hormone\">Hormone Tests<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.ultalabtests.com\/testing\/categories\/hormone\/endocrine-tests\">Endocrine Tests<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.ultalabtests.com\/testing\/categories\/kidney\">Kidney Tests<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.ultalabtests.com\/testing\/categories\/heart-and-cardiovascular\">Heart &amp; Cardiovascular Tests<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.ultalabtests.com\/testing\/categories\/kidney\/kidney-health\">Kidney Health Tests<\/a><\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Questions to Ask Your Healthcare Provider<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Does my hypertension pattern make primary aldosteronism screening appropriate?<\/li>\n\n\n\n<li>Which of my medications could change renin, aldosterone, or the ARR?<\/li>\n\n\n\n<li>Should I remain on my current medicines for the first screen, or is a supervised adjustment necessary?<\/li>\n\n\n\n<li>Is my potassium low enough to make aldosterone falsely reassuring?<\/li>\n\n\n\n<li>Which assay and units were used for aldosterone and renin?<\/li>\n\n\n\n<li>If my first screen is negative, is the clinical probability high enough to repeat it?<\/li>\n\n\n\n<li>If the screen is positive, do I need suppression testing before deciding on treatment?<\/li>\n\n\n\n<li>If an adrenal nodule is present, would AVS be needed before surgery?<\/li>\n\n\n\n<li>Should cortisol autonomy be evaluated as well?<\/li>\n\n\n\n<li>If I am treated medically, which potassium, kidney, renin, and blood-pressure markers will be monitored?<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Frequently Asked Questions<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Can I have primary aldosteronism with normal potassium?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Yes. Normal <a href=\"https:\/\/www.ultalabtests.com\/test\/potassium-test\">potassium<\/a> does not rule PA out. Potassium is important for interpretation and safety, but the core screening relationship is aldosterone relative to renin.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">What is the best blood test for primary aldosteronism?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Screening generally uses aldosterone and renin together with an ARR. The <a href=\"https:\/\/www.ultalabtests.com\/test\/aldosterone-and-plasma-renin-activity-ratio-test\">Aldosterone and Plasma Renin Activity Ratio Test<\/a> is designed around that relationship. The result still requires interpretation of the absolute hormone values, potassium, medications, kidney function, and collection conditions.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Does a high aldosterone result mean I have PA?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">No. Aldosterone can rise for reasons in which renin is also appropriately active. PA is specifically a pattern of aldosterone production that is inappropriate for a suppressed-renin state.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Does a high ARR prove primary aldosteronism?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">No. The ratio can be distorted by very low renin, medication effects, assay methodology, kidney disease, potassium, sodium intake, posture, and timing. A positive-looking screen may need repeat or confirmatory evaluation depending on the clinical context.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Should I stop my blood-pressure medicine before an ARR test?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Not on your own. Some medicines can cause false-positive- or false-negative-looking patterns, but stopping them can be unsafe. Modern guidelines allow different medication strategies based on safety and the likelihood of PA.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Why might an ARR be repeated?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Repeat testing can help when low potassium, interfering medication, nonstandard collection conditions, borderline results, or high clinical probability makes the first screen less reliable.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Can CT alone tell whether surgery will cure PA?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Usually not. CT shows adrenal anatomy. In many surgical candidates, AVS is used to determine whether aldosterone production is functionally lateralized to one gland.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">What should be monitored after PA treatment?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Monitoring commonly includes blood pressure, <a href=\"https:\/\/www.ultalabtests.com\/test\/potassium-test\">potassium<\/a>, <a href=\"https:\/\/www.ultalabtests.com\/test\/creatinine\">kidney function<\/a>, and renin. Aldosterone may also be reassessed when clinically appropriate.<\/p>\n\n\n\n<h2 id=\"h-summary\" class=\"wp-block-heading\">Summary<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Primary aldosteronism is a renin-independent adrenal aldosterone disorder that can drive hypertension even when potassium is normal. Screening is based on aldosterone and renin together, usually expressed as an aldosterone-to-renin ratio. Interpretation requires the absolute aldosterone and renin results, potassium, kidney function, medication exposure, sodium intake, posture, timing, units, and assay method. Low potassium can falsely lower aldosterone.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A positive ARR does not establish which adrenal gland is responsible; subtype testing and treatment planning are clinician directed. During treatment, blood pressure, potassium, kidney function, and renin are important monitoring markers.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Conclusion<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Primary aldosteronism is a hormone-driven cause of high blood pressure that is best recognized by reading aldosterone and renin together.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The highest-value screening question is whether renin is suppressed while aldosterone remains inappropriately active. Potassium and kidney function provide essential context, while medication effects and assay methods can change the apparent ARR.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A practical pathway is:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Hypertension \u2192 aldosterone + renin + ARR + potassium\/kidney function \u2192 identify the suppressed-renin pattern \u2192 repeat when confounded \u2192 decide whether clinician-directed confirmation is needed \u2192 determine unilateral vs. bilateral disease when treatment planning requires it \u2192 monitor blood pressure, potassium, kidney function, and renin after treatment.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For the broader workup around a high reading\u2014including UACR, glucose, lipids, thyroid, kidney testing, and medication safety\u2014continue with the <a href=\"https:\/\/www.ultalabtests.com\/blog\/heart-and-cardiovascular\/high-blood-pressure-hypertension\/hypertension-lab-tests\/\">Hypertension Lab Tests<\/a> hub.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">References<\/h2>\n\n\n\n<ol class=\"wp-block-list\">\n<li><a href=\"https:\/\/www.endocrine.org\/clinical-practice-guidelines\/primary-aldosteronism-2\" target=\"_blank\" rel=\"noopener\">Endocrine Society. Primary Aldosteronism Clinical Practice Guideline. 2025.<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/academic.oup.com\/jcem\/article\/110\/9\/2453\/8196671\" target=\"_blank\" rel=\"noopener\">Adler GK, et al. Primary Aldosteronism: An Endocrine Society Clinical Practice Guideline. <em>Journal of Clinical Endocrinology &amp; Metabolism.<\/em> 2025;110(9):2453\u20132503.<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/professional.heart.org\/en\/science-news\/2025-high-blood-pressure-guideline\/top-things-to-know\" target=\"_blank\" rel=\"noopener\">American Heart Association. 2025 High Blood Pressure Guideline: Top Things to Know.<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.heart.org\/en\/health-topics\/high-blood-pressure\/understanding-blood-pressure-readings\/when-to-call-911-for-high-blood-pressure\" target=\"_blank\" rel=\"noopener\">American Heart Association. When to Call 911 About High Blood Pressure.<\/a><\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"<p>High blood pressure is not always \u201cessential\u201d hypertension. In primary aldosteronism (PA), one or both adrenal glands produce aldosterone partly independently of the body\u2019s normal renin control system. The result can be sodium retention, suppressed [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":3614,"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":[172,6,146,156,204,222,217,233],"tags":[5690,5694,4517,5691,5695,5699,5693,5696,5698,5692,4382,5697],"class_list":["post-3602","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-endocrine","category-heart-and-cardiovascular","category-high-blood-pressure-hypertension","category-hormone","category-kidney","category-all-kidney","category-kidney-disease","category-kidney-health","tag-adrenal-gland","tag-aldosterone","tag-aldosterone-renin-ratio","tag-arr","tag-conn-syndrome","tag-hyperaldosteronism","tag-low-renin-hypertension","tag-potassium","tag-primary-aldosteronism","tag-renin","tag-resistant-hypertension","tag-secondary-hypertension"],"acf":[],"yoast_head":"<!-- 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