Persistent fatigue is common, but fatigue accompanied by low blood pressure, dizziness when standing, unexplained weight loss, nausea, salt craving, low sodium, high potassium, or low blood glucose deserves closer attention. Together, these findings may point toward adrenal insufficiency, a condition in which the body does not produce enough cortisol.
Cortisol helps the body maintain blood pressure, regulate blood glucose, manage inflammation, use nutrients for energy, and respond to physical stress. In primary adrenal insufficiency—often called Addison’s disease—the adrenal glands may also fail to produce enough aldosterone, a hormone that helps regulate sodium, potassium, fluid volume, and blood pressure.
Because fatigue, weakness, digestive symptoms, and weight changes can arise from many different conditions, symptoms alone cannot establish adrenal insufficiency. Properly timed early-morning serum cortisol and plasma ACTH, electrolyte measurements through a Comprehensive Metabolic Panel Test (CMP), and selected follow-up testing can help reveal whether a concerning hormone pattern is present.
Ulta Lab Tests provides direct online access to many relevant laboratory tests where available. Testing can provide objective information for a more informed discussion with a qualified healthcare provider, but it does not replace professional evaluation, diagnose a condition by itself, or determine whether medication should be started, stopped, or changed.
Emergency warning: Severe weakness, fainting, confusion, repeated vomiting or diarrhea, profound low blood pressure, severe dehydration, severe abdominal or back pain, or rapid deterioration may indicate adrenal crisis. Seek emergency medical care rather than waiting for outpatient laboratory results.
Adrenal insufficiency is a recognized endocrine disorder in which cortisol production is inadequate for the body’s needs. It may originate in the adrenal glands, pituitary gland, hypothalamus, or from suppression of the hypothalamic-pituitary-adrenal axis by corticosteroid medication.
The hypothalamus and pituitary gland normally regulate cortisol production. The hypothalamus releases corticotropin-releasing hormone, which signals the pituitary to release adrenocorticotropic hormone, or ACTH. ACTH then signals the adrenal glands to make cortisol.
| Type | Where the problem begins | Expected ACTH pattern | Aldosterone and electrolyte pattern |
|---|---|---|---|
| Primary adrenal insufficiency—Addison’s disease | The adrenal glands are damaged or unable to produce enough hormones. | Usually elevated when cortisol deficiency is confirmed. | Aldosterone may be low, contributing to sodium loss, potassium elevation, dehydration, salt craving, and low blood pressure. |
| Secondary adrenal insufficiency | The pituitary gland does not release enough ACTH. | Low or inappropriately normal. | Aldosterone is generally preserved; significant potassium elevation and severe salt wasting are less typical. |
| Tertiary adrenal insufficiency | The hypothalamus does not provide adequate stimulation, frequently because of prolonged corticosteroid exposure. | Low or inappropriately normal. | Aldosterone is generally preserved. |
This distinction matters because laboratory patterns, possible causes, treatment requirements, and emergency-prevention needs differ.
Primary adrenal insufficiency is most often caused by autoimmune destruction of adrenal tissue in developed countries. Other possible causes include infection, bleeding into the adrenal glands, cancer involving the adrenals, genetic disorders, removal of both adrenal glands, and medications that interfere with adrenal hormone production.
Secondary adrenal insufficiency may occur with pituitary tumors, pituitary surgery, radiation, pituitary bleeding, traumatic brain injury, infection, or other conditions affecting ACTH production.
Tertiary or glucocorticoid-induced adrenal insufficiency may develop when corticosteroid exposure suppresses normal hypothalamic and pituitary signaling. Oral steroids are important, but inhaled steroids, topical products, nasal sprays, eye drops, joint or spinal injections, and the combined use of several steroid formulations may also contribute in some situations.
Fatigue, weakness, reduced exercise tolerance, nausea, weight change, and dizziness are nonspecific. Similar symptoms can occur with anemia, iron deficiency, thyroid disease, infection, inflammatory illness, dehydration, kidney disease, heart disease, gastrointestinal disease, malnutrition, nutrient deficiency, sleep disorders, depression, medication effects, inadequate calorie intake, or overtraining.
Objective testing—such as the Cortisol AM Test, ACTH Test, Comprehensive Metabolic Panel Test (CMP), Complete Blood Count with Differential and Platelets (CBC), TSH and Free T4 Test, Ferritin Test, and Vitamin B12 Test—can help distinguish a cortisol-related pattern from several common alternatives.
Cortisol supports several essential functions. It helps maintain blood pressure and vascular tone, contributes to normal glucose regulation, affects metabolism and inflammation, and helps the body respond to illness, injury, surgery, and other forms of physical stress.
Aldosterone helps the kidneys retain sodium and water while excreting potassium. When both cortisol and aldosterone are deficient, as may happen in primary adrenal insufficiency, the result can include dehydration, declining blood pressure, salt craving, low sodium, and high potassium.
Untreated or inadequately managed adrenal insufficiency can become particularly dangerous during infection, surgery, trauma, vomiting, or diarrhea. These stressors increase the body’s need for cortisol and may also prevent someone with known adrenal insufficiency from absorbing oral replacement medication.
An extreme cortisol shortage can lead to adrenal crisis, a potentially fatal emergency involving severe low blood pressure, dehydration, electrolyte abnormalities, low glucose, vomiting, abdominal or back pain, confusion, loss of consciousness, or shock.
| Symptom or risk factor | What it may suggest | Related tests that may provide more information |
|---|---|---|
| Persistent fatigue or muscle weakness | Possible cortisol deficiency, but also anemia, thyroid disease, infection, poor nutrition, or other conditions. | Cortisol AM Test, ACTH Test, Complete Blood Count with Differential and Platelets (CBC), Comprehensive Metabolic Panel Test (CMP), TSH and Free T4 Test, Ferritin Test, and Vitamin B12 Test |
| Unexplained loss of appetite or weight | May occur with adrenal insufficiency, gastrointestinal disease, thyroid disease, cancer, infection, or malabsorption. | Cortisol AM Test, ACTH Test, Comprehensive Metabolic Panel Test (CMP), Complete Blood Count with Differential and Platelets (CBC), and TSH and Free T4 Test |
| Nausea, abdominal pain, vomiting, or diarrhea | Can occur with adrenal insufficiency; persistent vomiting or diarrhea increases crisis risk in diagnosed patients. | Comprehensive Metabolic Panel Test (CMP), Cortisol AM Test, and ACTH Test |
| Low blood pressure or dizziness when standing | Possible volume depletion, aldosterone deficiency, dehydration, medication effect, or autonomic dysfunction. | Lying and standing blood pressure, Comprehensive Metabolic Panel Test (CMP), Cortisol AM Test, ACTH Test, and Aldosterone and Plasma Renin Activity Ratio Test |
| Salt craving | May reflect sodium loss related to aldosterone deficiency but is not specific. | Comprehensive Metabolic Panel Test (CMP), Aldosterone and Plasma Renin Activity Ratio Test, Cortisol AM Test, and ACTH Test |
| Low sodium | May occur with primary or central adrenal insufficiency, but also with medications, vomiting, kidney disease, heart disease, and abnormal antidiuretic hormone activity. | Comprehensive Metabolic Panel Test (CMP), Cortisol AM Test, ACTH Test, and Aldosterone and Plasma Renin Activity Ratio Test |
| High potassium | More characteristic of primary disease with aldosterone deficiency; kidney disease and medications are common alternative causes. | Comprehensive Metabolic Panel Test (CMP), Aldosterone and Plasma Renin Activity Ratio Test, Cortisol AM Test, and ACTH Test |
| Low blood glucose | Cortisol deficiency is one possibility, but glucose-lowering medication, reduced food intake, liver disease, and other disorders must be considered. | Glucose Plasma Test, Comprehensive Metabolic Panel Test (CMP), Cortisol AM Test, and ACTH Test |
| Darkening of scars, skin folds, gums, or pressure points | May reflect elevated ACTH in primary adrenal insufficiency. | Cortisol AM Test, ACTH Test, and 21 Hydroxylase Antibody Test |
| Current or recent corticosteroid exposure | May suppress the hypothalamic-pituitary-adrenal axis. | Medication review and clinician-directed Cortisol AM Test during an appropriate tapering stage |
| Pituitary surgery, tumor, radiation, injury, or severe headache with visual symptoms | Raises concern for secondary adrenal insufficiency and possible deficiency of other pituitary hormones. | Cortisol AM Test, ACTH Test, TSH and Free T4 Test, Prolactin Test, LH Test, FSH Test, Estradiol Test or Testosterone Total Test, and IGF-1 Test |
| Another autoimmune endocrine disorder | Autoimmune conditions may cluster. | Cortisol AM Test, ACTH Test, 21 Hydroxylase Antibody Test, TSH and Free T4 Test, Thyroid Peroxidase and Thyroglobulin Antibodies Test, A1c Test, Tissue Transglutaminase IgA Antibody Test, IgA Test, and Vitamin B12 Test |
Safety note: Seek emergency care for fainting, confusion, loss of consciousness, severe weakness with very low blood pressure, repeated vomiting or diarrhea, severe abdominal or back pain, signs of shock, profound dehydration, or rapid deterioration. Do not delay emergency treatment while waiting for outpatient cortisol results.
Laboratory testing helps determine whether cortisol production appears inadequate, whether the pattern is more consistent with primary or central adrenal insufficiency, whether aldosterone deficiency is affecting electrolytes and blood pressure, and whether an autoimmune or pituitary cause should be investigated.
A single random cortisol value generally cannot confirm or exclude every case of adrenal insufficiency, establish whether the cause is adrenal, pituitary, hypothalamic, or medication-related, determine whether a person should change corticosteroid medication, replace a clinician-supervised ACTH stimulation test when confirmation is needed, or explain every cause of fatigue and dizziness.
Cortisol has a strong daily rhythm and is normally highest in the morning. An afternoon or evening result may be substantially lower than a morning result even in someone without adrenal insufficiency. Interpretation also depends on sleep schedule, acute illness, pregnancy, medications, binding proteins, and laboratory methodology.
This pattern suggests that the pituitary is strongly signaling the adrenal glands, but the glands are not producing adequate cortisol. In a person with confirmed cortisol deficiency, an ACTH result above twice the upper limit of the laboratory reference range is considered consistent with primary adrenal insufficiency.
Supporting findings may include low sodium, high potassium, low glucose, high renin, low or inappropriately normal aldosterone, low blood pressure, salt craving, and skin or mucous-membrane darkening. Not everyone has every abnormality, especially early in the disease.
This pattern points toward secondary or tertiary adrenal insufficiency. Possibilities include pituitary or hypothalamic disease and suppression from corticosteroid exposure.
Because aldosterone is usually preserved, potassium may remain normal and severe salt wasting is less typical. Other pituitary hormones may also be affected when the problem originates in the pituitary gland, which is why testing may include the TSH and Free T4 Test, Prolactin Test, LH Test, FSH Test, Estradiol Test or Testosterone Total Test, and IGF-1 Test.
This combination supports mineralocorticoid deficiency and therefore favors primary adrenal insufficiency. The Aldosterone and Plasma Renin Activity Ratio Test is influenced by posture, hydration, sodium intake, kidney function, and blood-pressure medications, so collection preparation should follow the specific laboratory and clinician instructions.
Hyponatremia, or low sodium, occurs in many conditions. It becomes more suggestive of primary adrenal insufficiency when it appears with low cortisol, elevated ACTH, high potassium, elevated renin, low aldosterone, volume depletion, and low blood pressure. A Comprehensive Metabolic Panel Test (CMP) can document the electrolyte pattern but cannot identify the cause by itself.
Potassium elevation mainly reflects aldosterone deficiency. Because aldosterone is usually preserved in secondary, tertiary, and glucocorticoid-induced adrenal insufficiency, potassium may be entirely normal despite meaningful cortisol deficiency.
Corticosteroid-related adrenal suppression is easily overlooked because patients may not recognize every steroid-containing product.
The 2024 European Society of Endocrinology–Endocrine Society guideline states that expected risk from oral exposure generally requires both a duration of at least three to four weeks and a dose above the approximate physiologic range—more than 15–25 milligrams of hydrocortisone equivalent daily, or roughly 4–6 milligrams of prednisone or prednisolone. Individual risk varies, and high-dose or combined non-oral exposure may also be relevant.
Do not stop or rapidly reduce a prescribed long-term corticosteroid because of symptoms or a direct-access cortisol result. Tapering and recovery testing must be coordinated with the prescribing healthcare professional.
| Lab test or biomarker | What it measures | Why it may be relevant | Important limitations |
|---|---|---|---|
| Cortisol AM Test | Total cortisol in a morning blood sample. | A low result may suggest inadequate production. A clearly reassuring result may make significant deficiency less likely in some settings. | Must be interpreted by collection time, assay, illness, pregnancy, estrogen exposure, sleep schedule, and corticosteroid use. One result may not confirm or exclude disease. |
| ACTH Test | Pituitary hormone that stimulates adrenal cortisol production. | High ACTH with low cortisol supports primary disease. Low or inappropriately normal ACTH with low cortisol suggests secondary or tertiary disease. | Best interpreted with cortisol from the same collection; reference ranges and specimen handling matter. |
| ACTH stimulation test | Cortisol response before and after synthetic ACTH, also called cosyntropin. | An inadequate cortisol rise supports adrenal insufficiency. | Usually clinician-supervised. Cutoffs are assay-dependent, and early secondary disease may occasionally produce a seemingly adequate response. |
| Comprehensive Metabolic Panel Test (CMP) | Sodium, potassium, glucose, creatinine, calcium, liver markers, proteins, and other measurements. | Low sodium, high potassium, low glucose, or kidney-related abnormalities may support or complicate the clinical picture. | These abnormalities have many causes and cannot diagnose adrenal insufficiency. |
| Aldosterone and Plasma Renin Activity Ratio Test | Hormones involved in fluid volume, sodium, potassium, and blood-pressure regulation. | High renin with low or inappropriately normal aldosterone supports mineralocorticoid deficiency and primary adrenal disease. | Strongly affected by posture, sodium intake, hydration, kidney function, and medications. |
| 21 Hydroxylase Antibody Test | Autoantibodies directed against an adrenal enzyme. | A positive result supports autoimmune adrenalitis as the cause of confirmed primary adrenal insufficiency. | A negative result does not exclude primary disease from another cause. It is not a stand-alone screening test for nonspecific fatigue. |
| Complete Blood Count with Differential and Platelets (CBC) | Red cells, white cells, hemoglobin, hematocrit, and platelets. | May identify anemia, infection, or another contributor to weakness and reduced exercise tolerance. | Does not assess cortisol production. |
| TSH and Free T4 Test | Thyroid-regulating hormone and circulating free thyroxine. | May identify primary thyroid disease or a pituitary pattern when Free T4 is low with low or inappropriately normal TSH. | Thyroid testing does not diagnose adrenal insufficiency. Thyroid-treatment decisions require clinical oversight when adrenal disease is possible. |
| Ferritin Test, Iron and Total Iron Binding Capacity Test, Vitamin B12 Test, and Folate Serum Test | Iron stores, iron transport, vitamin B12, and folate status. | May identify common non-adrenal causes of fatigue, weakness, anemia, or poor exercise tolerance. | These are not adrenal-function tests; abnormal results require cause-specific interpretation. |
| Tissue Transglutaminase IgA Antibody Test and IgA Test | Antibodies used in celiac-disease evaluation and total IgA status. | May be considered when autoimmune clustering, malabsorption, diarrhea, or nutrient deficiency is present. | Not necessary for every person being evaluated for adrenal insufficiency. |
| Thyroid Peroxidase and Thyroglobulin Antibodies Test | Thyroid peroxidase and thyroglobulin antibodies. | May help evaluate autoimmune thyroid disease when clinical findings or thyroid-hormone results suggest it. | Positive antibodies do not by themselves define thyroid function or explain every symptom. |
| Prolactin Test, LH Test, FSH Test, Estradiol Test or Testosterone Total Test, and IGF-1 Test | Selected pituitary-regulated hormones. | Can help identify broader pituitary dysfunction when ACTH is low or pituitary disease is suspected. | Selection and interpretation depend on age, sex, menstrual status, medications, and clinical history; imaging may also be required. |
| DHEA-S Test | An adrenal androgen precursor. | May be low in primary or central adrenal insufficiency and can provide supporting context. | Varies substantially with age, sex, medications, and other endocrine conditions. It cannot replace cortisol, ACTH, or stimulation testing. |
| A1c Test, Lipid Panel Test, and Vitamin D 25-Hydroxy Total Test | Long-term glucose exposure, blood lipids, and vitamin D status. | May provide context when prolonged or excessive glucocorticoid exposure raises metabolic or bone-health concerns. | These tests do not diagnose adrenal insufficiency and should be ordered according to individual risk and clinical context. |
The Adrenal Insufficiency and Addison Disease Panel combines several relevant measurements in one order. A bundled panel may simplify preliminary data collection, but it should not be presented as a replacement for a clinician-supervised stimulation test, physical examination, imaging, or emergency evaluation.
Testing should be selected according to symptoms, risk factors, medication history, and previous results. Not everyone needs every test.
A stable patient with a concerning symptom pattern may discuss:
Morning cortisol and ACTH should be interpreted together. A random afternoon cortisol generally provides less useful information.
When preliminary findings or clinical suspicion remain concerning, the ACTH stimulation test is commonly used to confirm adrenal insufficiency. Synthetic ACTH is administered, and cortisol is measured before and approximately 30 and/or 60 minutes afterward.
This is typically a clinician-directed procedure rather than a routine standalone blood draw. Treatment should not be delayed for stimulation testing when adrenal crisis is suspected.
When primary adrenal insufficiency is suspected or confirmed, testing may include the Aldosterone and Plasma Renin Activity Ratio Test and 21 Hydroxylase Antibody Test. Evaluation for infection, bleeding, cancer, genetic disease, or other adrenal causes may be needed when clinically appropriate.
When ACTH is low or inappropriately normal, testing may include the TSH and Free T4 Test, Prolactin Test, LH Test, FSH Test, Estradiol Test or Testosterone Total Test, and IGF-1 Test. Pituitary MRI may also be required.
Depending on the history and symptoms, useful tests may include the Ferritin Test, Iron and Total Iron Binding Capacity Test, Vitamin B12 Test, Folate Serum Test, A1c Test, Glucose Plasma Test, Tissue Transglutaminase IgA Antibody Test, IgA Test, Thyroid Peroxidase and Thyroglobulin Antibodies Test, and Vitamin D 25-Hydroxy Total Test.
For a person with a confirmed diagnosis, monitoring may include symptoms and energy level, body weight, lying and standing blood pressure, sodium and potassium through a Comprehensive Metabolic Panel Test (CMP), glucose or A1c Test when excessive glucocorticoid exposure is a concern, bone-health assessment during prolonged glucocorticoid exposure, periodic evaluation for associated autoimmune conditions, and review of crisis-prevention and illness-management instructions.
Routine cortisol testing is generally not used to adjust established glucocorticoid replacement. Clinical response, weight, blood pressure, energy, and signs of under- or over-replacement are usually more informative.
Reference ranges vary among laboratories because instruments, assays, calibration methods, and populations differ. Cortisol cutoffs are particularly method-dependent. For adrenal insufficiency, guideline-based and assay-specific interpretation is more appropriate than applying an unvalidated consumer “optimal range.”
The Endocrine Society guideline describes a morning cortisol below 5 µg/dL, paired with ACTH, as suggestive when ACTH stimulation testing is not immediately feasible. It is not intended to replace confirmatory testing in a stable patient.
The 2016 Endocrine Society guideline used a stimulated peak cortisol below 18 µg/dL as evidence of adrenal insufficiency while explicitly identifying that threshold as assay-dependent. Newer cortisol methods may use different cutoffs. The correct interpretation is the performing laboratory’s validated cutoff—not one universal number taken from an article or older report.
The 2024 guideline offers morning-cortisol guidance for people who have tapered to a physiologic glucocorticoid dose and are being evaluated for recovery of the hypothalamic-pituitary-adrenal axis:
These thresholds apply to recovery after glucocorticoid suppression. They should not be used indiscriminately to diagnose every suspected case of Addison’s disease or central adrenal insufficiency. Medication decisions must remain under clinician supervision.
Low sodium, high potassium, low glucose, and low blood pressure all have alternative explanations. Cortisol may also appear lower or higher because of collection timing, illness, pregnancy, sleep pattern, medication effects, or differences in cortisol-binding proteins.
A normal potassium result does not exclude cortisol deficiency. Early secondary adrenal insufficiency may occasionally be difficult to identify with a standard stimulation test because the adrenal glands may retain temporary responsiveness after pituitary signaling has declined.
Ulta Lab Tests allows patients to order many laboratory tests directly online where available. Relevant options include the Cortisol AM Test, ACTH Test, Comprehensive Metabolic Panel Test (CMP), 21 Hydroxylase Antibody Test, Aldosterone and Plasma Renin Activity Ratio Test, and Adrenal Insufficiency and Addison Disease Panel.
Patients can review transparent pricing before ordering. Insurance is not required for direct-access purchases, and eligible HSA or FSA payment may be accepted where available. Specimen collection is performed through established laboratory networks such as Quest Diagnostics where applicable, and results are delivered securely online.
Results can then support a more informed conversation with a qualified healthcare provider. Direct-access testing does not replace clinician-supervised stimulation testing, imaging, medication management, or emergency care.
Explore the Adrenal Insufficiency and Addison Disease testing category.
The Cortisol AM Test is collected early in the day because cortisol normally peaks in the morning. Follow the exact collection window on the laboratory order. People with unusual sleep schedules should discuss timing with a healthcare professional.
Different corticosteroids can affect cortisol testing in different ways. Prepare a complete list of oral corticosteroids, inhalers, nasal sprays, skin products, eye drops, recent injections, and over-the-counter or compounded “adrenal” products. Do not skip, delay, or discontinue a prescribed dose unless the prescribing clinician provides specific instructions.
The Cortisol AM Test and ACTH Test may not always require fasting, but a combined order or panel may have different preparation requirements. Check the instructions for every test in the order.
Dehydration can affect blood pressure, kidney markers, sodium, and renin. Do not intentionally increase or restrict fluid or salt intake solely to influence a result.
Posture, sodium intake, time of day, and several medications can alter the Aldosterone and Plasma Renin Activity Ratio Test. Do not change blood-pressure medication, diuretics, potassium products, or salt intake without clinician guidance.
Bring the required identification and laboratory requisition, along with an updated list of medications, supplements, and recent steroid injections.
Repeat testing depends on the original result, symptoms, medication exposure, assay used, and the question being asked. Evaluation for steroid-axis recovery follows a different schedule from evaluation for suspected autoimmune Addison’s disease. A healthcare provider should determine whether repeat cortisol, stimulation testing, or other follow-up is appropriate.
The preliminary evaluation commonly includes a Cortisol AM Test and ACTH Test collected together. A Comprehensive Metabolic Panel Test (CMP) assesses sodium, potassium, glucose, and kidney function. The Aldosterone and Plasma Renin Activity Ratio Test helps assess mineralocorticoid function, while the 21 Hydroxylase Antibody Test may identify autoimmune adrenalitis. A clinician-supervised ACTH stimulation test is often used for confirmation.
A Cortisol AM Test can provide an important clue, but one result usually cannot diagnose Addison’s disease by itself. Cortisol should be interpreted with an ACTH Test, collection time, symptoms, medications, electrolyte results, and laboratory method. In stable patients, an ACTH stimulation test is often used to confirm inadequate adrenal reserve.
Low cortisol with clearly elevated ACTH suggests that the pituitary is sending a strong signal, but the adrenal glands are not responding adequately. This pattern supports primary adrenal insufficiency. When cortisol deficiency is confirmed, an ACTH result more than twice the upper limit of the laboratory reference range is considered consistent with primary disease.
ACTH may be “normal” according to the printed range but still inappropriate when cortisol is low. Low cortisol with low or inappropriately normal ACTH can suggest secondary or tertiary adrenal insufficiency, including pituitary disease, hypothalamic dysfunction, or suppression from corticosteroid medication. Additional pituitary evaluation may be appropriate.
Yes. Primary adrenal insufficiency may reduce aldosterone, leading to sodium loss, fluid depletion, elevated renin, and potassium retention. However, both electrolyte abnormalities have many other causes. A Comprehensive Metabolic Panel Test (CMP) and Aldosterone and Plasma Renin Activity Ratio Test can document the pattern, but results must be interpreted with cortisol, ACTH, medications, kidney function, blood pressure, and clinical findings.
No. High potassium is mainly associated with aldosterone deficiency and is therefore more characteristic of primary adrenal insufficiency. Secondary, tertiary, and glucocorticoid-induced adrenal insufficiency usually preserve aldosterone. A person may therefore have meaningful cortisol deficiency with completely normal potassium.
Long-term or sufficiently high corticosteroid exposure can suppress the hypothalamic-pituitary-adrenal axis. Sudden withdrawal may leave the body unable to produce enough cortisol, particularly during illness or other physical stress. Prescribed corticosteroids should never be stopped or rapidly reduced because of symptoms or a direct-access cortisol result.
No. Adrenal insufficiency is a medically recognized hormone-deficiency disorder evaluated with validated testing. “Adrenal fatigue” is not an established medical diagnosis, and blood or saliva panels marketed for it do not have validated diagnostic criteria. Persistent fatigue should be evaluated for recognized endocrine, hematologic, metabolic, sleep, nutritional, infectious, and mental-health conditions.
Ulta Lab Tests allows patients to order many relevant tests directly online where available, including the Cortisol AM Test, ACTH Test, Comprehensive Metabolic Panel Test (CMP), Aldosterone and Plasma Renin Activity Ratio Test, 21 Hydroxylase Antibody Test, and Adrenal Insufficiency and Addison Disease Panel. Direct-access results can document an important pattern but should be reviewed with a qualified healthcare provider. Stimulation testing and medication decisions generally require clinical supervision.
The ACTH stimulation test measures cortisol before and after administration of synthetic ACTH, usually with follow-up samples at approximately 30 and/or 60 minutes. A healthy adrenal gland should increase cortisol production. Interpretation must use the performing laboratory’s assay-specific cutoff rather than one universal number.
Repeat or confirmatory testing may be appropriate when the collection time was unsuitable, the result was borderline, medication or illness may have affected the measurement, or the hormone pattern is incomplete. The next step may be another Cortisol AM Test with an ACTH Test, clinician-supervised ACTH stimulation testing, or another targeted evaluation.
Emergency evaluation is needed for severe weakness with profound low blood pressure, fainting, confusion, repeated vomiting or diarrhea, severe abdominal or back pain, marked dehydration, shock, or rapid decline. A person with known adrenal insufficiency who cannot keep medication down also requires immediate medical guidance. Suspected adrenal crisis should be treated before confirmatory results return.
Adrenal insufficiency is identified through a hormone and clinical pattern—not fatigue alone and not one random cortisol result. Persistent fatigue becomes more concerning when it occurs with low blood pressure, dizziness on standing, unexplained weight loss, nausea, salt craving, low sodium, high potassium, low glucose, skin darkening, pituitary disease, or current or recent corticosteroid exposure.
The most useful preliminary laboratory approach generally pairs a Cortisol AM Test with an ACTH Test and evaluates sodium, potassium, glucose, and kidney function through a Comprehensive Metabolic Panel Test (CMP). The Aldosterone and Plasma Renin Activity Ratio Test and 21 Hydroxylase Antibody Test can provide information about the type and cause, while clinician-supervised ACTH stimulation testing may be needed for confirmation.
Ulta Lab Tests offers direct online access to many relevant tests where available, helping patients gather objective information and prepare for a more informed healthcare discussion. Explore the Adrenal Insufficiency and Addison Disease testing category, and review all results promptly with a qualified healthcare provider—preferably one experienced in endocrine disorders.
Do not use direct-access results to stop or change corticosteroid medication, and do not wait for outpatient testing when symptoms suggest adrenal crisis.
Adrenal insufficiency is a medical condition in which the body does not produce enough cortisol. Primary adrenal insufficiency, or Addison’s disease, may also reduce aldosterone, leading to low blood pressure, sodium loss, elevated potassium, dehydration, and salt craving.
Related lab tests: Cortisol AM Test, ACTH Test, Comprehensive Metabolic Panel Test (CMP), Aldosterone and Plasma Renin Activity Ratio Test, 21 Hydroxylase Antibody Test, Complete Blood Count with Differential and Platelets (CBC), TSH and Free T4 Test, Ferritin Test, Vitamin B12 Test, Tissue Transglutaminase IgA Antibody Test, IgA Test, and selected pituitary hormone tests.
How Ulta Lab Tests helps: Ulta Lab Tests provides direct online access to many relevant laboratory tests where available, with transparent pricing and secure online results.
Disclaimer: Laboratory testing provides information but does not replace diagnosis, treatment, medication management, or emergency evaluation by a qualified healthcare provider.
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These tests are most relevant when ACTH is low or inappropriately normal, the history suggests pituitary disease, or other pituitary hormone deficiencies are being considered.
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