Recommends against using a random cortisol level to diagnose adrenal insufficiency. Triggers when considering a random cortisol test for AI evaluation (e.g., "random cortisol measurement being considered for AI diagnosis").
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---
name: ata-random-cortisol-ai-against
description: Recommends against using a random cortisol level to diagnose adrenal insufficiency. Triggers when considering a random cortisol test for AI evaluation (e.g., "random cortisol measurement being considered for AI diagnosis").
---
# Recommend against random cortisol level for AI diagnosis
## STEP 1 — Gather Information
Collect clinical signs/symptoms suggestive of adrenal insufficiency (fatigue, hypotension, hyponatremia, hyperkalemia), review timing of last glucocorticoid dose, and note if a random cortisol test is under consideration.
## STEP 2 — Rule In / Rule Out
If a random cortisol level is being considered for AI diagnosis, recommend against its use and proceed to obtain an 8–9 AM serum cortisol level; otherwise, proceed with appropriate diagnostic pathway.
## STEP 3 — Classify or Stratify
Interpret the 8–9 AM cortisol: <3 µg/dL suggests AI; >15 µg/dL makes AI unlikely; values between 3–15 µg/dL require an ACTH stimulation test.
## STEP 4 — Decide
If cortisol <3 µg/dL, diagnose AI and initiate glucocorticoid replacement; if >15 µg/dL, pursue alternative diagnoses; if 3–15 µg/dL, perform ACTH stim test and diagnose AI if peak cortisol ≤18.1 µg/dL (500 nmol/L).
## Clinical Guardrails / Mimics / Pitfalls
Do not rely on random cortisol due to circadian variation, estrogen-induced CBG elevation, and glucocorticoid interference; ensure patient is off exogenous glucocorticoids for adequate washout before testing; ACTH stimulation test remains the diagnostic standard when morning cortisol is indeterminate.
## Concrete Clinical Example
A 50‑year‑old woman presents with fatigue and hyponatremia; a random cortisol at 14:00 is considered. Instead, an 8 AM cortisol returns 2.5 µg/dL (<3), prompting an ACTH stim test with peak cortisol 10 µg/dL (<18.1), confirming AI; hydrocortisone 15–20 mg daily is started.
**Source:** Hormonal Replacement in Hypopituitarism in Adults: An Endocrine Society Clinical Practice Guideline, Endocrine Society, 2016, DOI:10.1210/jc.2016-2118
