---
title: "What does a low Cortisol AM mean?"
type: biomarker-interpretation
url: "https://www.test-well.com/biomarkers/cortisol-am/low"
biomarker: Cortisol AM
direction: low
reference_range:
  - "age 18+, drawn 6–10 AM: 6.20 – 19.4 mcg/dL"
reviewed_at: 2026-09-06
review_status: reviewed
date_published: 2026-09-05
---

# What does a low Cortisol AM mean?

> A low morning cortisol (especially below about 3–5 mcg/dL at 8 a.m.) can indicate adrenal insufficiency — Addison's disease, pituitary disease, or suppression of the adrenal axis by glucocorticoid medication, including inhaled and topical steroids. It is the one cortisol result that should not be ignored. Values between about 5 and 15 mcg/dL are indeterminate and usually prompt an ACTH stimulation test.


## When does this result need same-day care?

- Low cortisol with vomiting, confusion, low blood pressure or collapse — emergency care (possible adrenal crisis)

## What is the normal range for Cortisol AM?

- age 18+, drawn 6–10 AM: 6.20 – 19.4 mcg/dL

Can reflect adrenal insufficiency or recent steroid use.

## What are the common causes of low Cortisol AM?

1. Glucocorticoid use — prednisone, inhaled or high-potency topical steroids, joint injections — suppressing the body's own production
2. Primary adrenal insufficiency (Addison's disease, usually autoimmune)
3. Secondary adrenal insufficiency from pituitary disease or after stopping long-term steroids
4. Late-afternoon draw mistaken for a morning value

## What symptoms go with low Cortisol AM?

- Profound fatigue, weakness
- Nausea, poor appetite, weight loss
- Dizziness on standing, salt craving
- Darkened skin creases (primary adrenal insufficiency)

## What do clinicians usually check next?

- Confirm the draw time; repeat at 8 a.m. if unclear
- ACTH level and an ACTH (cosyntropin) stimulation test
- Sodium, potassium and glucose
- Review all steroid-containing medications

Follow-up tests at TestWell: [Glucose](https://www.test-well.com/tests/glucose-basic) ($14.99).

## How do you recheck Cortisol AM?

| Test or panel | Type | Price | Fasting | Results |
| --- | --- | --- | --- | --- |
| [Men's Hormone Panel](https://www.test-well.com/tests/mens-hormone-panel) | Panel (7 tests) | $199.99 | No | 3–5 business days |
| [Metabolism & Weight Loss Panel](https://www.test-well.com/tests/metabolism-panel) | Panel (8 tests) | $119.99 | Yes | 2–5 business days |
| [Fitness & Performance Panel](https://www.test-well.com/tests/fitness-performance-panel) | Panel (8 tests) | $119.99 | Yes | 2–5 business days |
| [Cortisol (AM)](https://www.test-well.com/tests/cortisol-am) | Test | $26.99 | No | 2–4 business days |

Plus one $6 lab processing fee per order; physician authorization included.

## Common questions

### My morning cortisol was 4. What now?

That's low enough to need prompt clinical follow-up — typically an ACTH stimulation test — and a review of any steroid medications. Don't wait for a routine appointment if you feel unwell.

## Related

- [What does a high Cortisol AM mean?](https://www.test-well.com/biomarkers/cortisol-am/high)
- [Cortisol AM reference ranges](https://www.test-well.com/biomarkers/cortisol-am)
- [Total Testosterone reference range](https://www.test-well.com/biomarkers/total-testosterone)
- [Free Testosterone reference range](https://www.test-well.com/biomarkers/free-testosterone)
- [SHBG reference range](https://www.test-well.com/biomarkers/shbg)

## Sources

- [Mayo Clinic Labs](https://www.mayocliniclabs.com/test-catalog/overview/8545)

---

Medically reviewed by Youmna DiStefano, MD (Medical Reviewer, TestWell); last reviewed 2026-09-06. Review policy: https://www.test-well.com/editorial-policy

Canonical page: https://www.test-well.com/biomarkers/cortisol-am/low
Machine-readable catalog: https://www.test-well.com/api/catalog.json · MCP server: https://www.test-well.com/mcp · Overview for agents: https://www.test-well.com/llms.txt

Prices are cash-pay, in USD, and include physician authorization; every order adds one flat $6 lab processing fee. Educational content is not a diagnosis — discuss results with a clinician.