Cortisol AM & PM Test – Cortisol Levels in Illinois

What this test is

This test measures the levels of cortisol, a hormone produced by the adrenal glands, at two different times of the day. Cortisol levels naturally fluctuate throughout the day, typically peaking in the morning and declining by the afternoon.

What it measures

• Cortisol AM — reflects morning cortisol levels
• Cortisol PM — reflects afternoon cortisol levels

What the test involves

The test involves a standard blood draw, usually conducted in the morning and again in the afternoon. This dual sample collection helps capture the daily pattern of cortisol levels.

Why it is often ordered

Clinicians typically order this test to assess adrenal gland function and investigate conditions related to abnormal cortisol production. It helps in understanding the body's stress response and metabolic processes.

Preparation

Preparation may involve specific instructions regarding diet or medication. Always follow the lab's guidelines for accurate results.

How results are reported

Results show cortisol levels for both morning and afternoon samples, and reference ranges vary by laboratory. Discuss results with your healthcare provider for interpretation.

Before you go

• Sample collection times
• Medication restrictions
• Dietary instructions