Q: Normal Levels

Random morning sample: considered normal if between 5-25 µg/dL. Random evening/night sample: considered normal if < 5-7 µg/dL. Without precise timing: the value has limited diagnostic utility and cannot be relied upon alone for medical decisions.

Question 1

Purpose Test

Accepted Answer

Emergency use: assessing patients suspected of acute adrenal insufficiency (Addisonian crisis) when symptoms appear such as severe hypotension, shock, or unexplained low sodium. Rapid initial assessment for patients suspected of Cushing’s syndrome with very obvious symptoms, as a markedly high random level may indicate the condition. Used as a screening test when timing of sample collection cannot be controlled, such as in certain hospitalized patients. Sometimes requested along with the ACTH stimulation (Cosyntropin) test as a primary measurement of adrenal function.

Question 2

Recommended groups

Accepted Answer

Patients in the emergency department or ICU experiencing unexplained vascular collapse (shock). Patients known to have adrenal insufficiency who show signs of acute deterioration. Patients exhibiting severe symptoms of hypercortisolism (Cushing’s syndrome) requiring rapid assessment. Outpatient clinic patients undergoing a comprehensive medical evaluation who cannot attend at the specific morning time.

Question 3

Symptoms indicative

Accepted Answer

Severe low blood pressure, dizziness, or fainting without an obvious cause (non-cardiac or non-bleeding). Severe abdominal pain, vomiting, diarrhea accompanied by extreme weakness and dizziness. Acute severe general weakness with low blood sodium. Signs of dehydration and vascular collapse in a patient known to have adrenal insufficiency.

Question 4

Frequently Asked Questions (FAQs)

Accepted Answer

Morning or evening cortisol measurement. Dexamethasone suppression test. ACTH stimulation (Cosyntropin) test. Very high (> 20-25 µg/dL) in a patient with Cushing-like symptoms → strongly supportive of diagnosis. Very low (< 3-5 µg/dL) in a patient with unexplained shock → strongly indicates adrenal insufficiency. Intermediate values are difficult to interpret without knowing the sample timing.

Question 5

Normal Levels

Accepted Answer

Random morning sample: considered normal if between 5-25 µg/dL. Random evening/night sample: considered normal if < 5-7 µg/dL. Without precise timing: the value has limited diagnostic utility and cannot be relied upon alone for medical decisions.

Random Serum Cortisol Test