Cortisol Serum: Morning Sample

What is a Morning Serum Cortisol Test?

The test measures the level of cortisol, a hormone produced by the adrenal glands, in a blood sample taken in the early morning (usually between 6–8 am). Cortisol follows a daily rhythm, peaking in the morning and falling toward the evening.

Key Parameters

Why the Test is Done

• Screening for adrenal gland disorders such as Cushing’s syndrome or Addison’s disease.
• Evaluating unexplained fatigue, weight changes, or mood disturbances that may be related to cortisol imbalance.
• Monitoring treatment for adrenal insufficiency or Cushing’s syndrome.
• Assessing stress response in certain clinical scenarios.

Early Detection

The test can help identify signs of adrenal disorders, but it does not diagnose on its own. A doctor interprets the result together with symptoms, medical history, and other investigations.

What Abnormal Results May Indicate

• High cortisol may suggest Cushing’s syndrome, chronic stress, or certain medications (e.g., steroids).
• Low cortisol may indicate Addison’s disease, pituitary dysfunction, or severe stress. Many factors—hydration, recent food intake, medications, illness, or stress—can influence cortisol levels.

Who Might Be Advised to Get This Test?

• Adults with unexplained weight gain, hypertension, or muscle weakness.
• Individuals on long‑term steroid therapy.
• Patients with suspected adrenal insufficiency or Cushing’s syndrome.
• Those with persistent fatigue or mood changes that do not respond to standard treatments.

Quick Summary

A morning serum cortisol test measures adrenal hormone levels to help detect or monitor adrenal gland disorders. Results must be interpreted in the context of clinical findings.

Preparation

• Fasting: No fasting required for a morning cortisol test.
• If combined with fasting tests (e.g., fasting glucose), follow the strictest instruction: fast for 8–12 hours.
• Procedure: A healthcare professional will draw a small amount of blood (usually 5 mL) from a vein in your arm using a needle. The process takes about 5 minutes.
• Comfort: You may feel a brief pinch when the needle is inserted. The sample is usually collected in a plain tube.
• Precautions: Avoid strenuous exercise, alcohol, and large meals on the day of the test if you are also doing fasting tests. Inform the clinician about any medications, especially steroids, as they can affect cortisol levels.
• After the test: You can resume normal activities immediately.

Please confirm the specific preparation instructions with your doctor or the laboratory. This information is for educational purposes only and does not replace professional medical advice.