Health & Diagnostics | Apollo Diagnostic Kolkata
Cortisol Blood Test: What It Measures, Why It's Done, and How to Prepare
Cortisol is often called the "stress hormone," but its role in the body goes far beyond helping you cope with a tight deadline. Produced by the adrenal glands, cortisol regulates metabolism, blood pressure, blood sugar, immunity, and your sleep-wake cycle. A simple blood test can reveal whether your cortisol levels are within a healthy range — helping doctors catch adrenal and pituitary problems early.
🧬 What Does Cortisol Control?
Cortisol production is controlled by the HPA axis — a feedback loop between the hypothalamus, pituitary gland, and adrenal glands. Levels naturally rise in the early morning to wake you up, then decline through the day, dropping to their lowest around midnight.
☀️ The Natural Daily Rhythm of Cortisol
Peak
Falling
Lower
Lowest
Why Would a Doctor Order This Test?
Your doctor may recommend a cortisol test if you show signs of a hormonal imbalance. Here's how high and low cortisol symptoms compare:
(Possible Cushing's Syndrome)
- Weight gain around face & abdomen
- Purple stretch marks
- High blood pressure
- Muscle weakness
- Anxiety or irritability
- Slow wound healing
(Possible Addison's Disease)
- Persistent fatigue & weakness
- Unintentional weight loss
- Low blood pressure, dizziness
- Darkening of the skin
- Salt cravings
- Nausea or abdominal pain
Doctors also order cortisol testing to monitor patients on long-term steroid therapy, evaluate adrenal or pituitary disorders, and investigate chronic, unexplained fatigue.
How to Prepare — 5 Simple Steps
Tell your doctor about steroids, birth control pills, or hormone therapy you're taking.
Get a regular night's sleep before the test — disrupted sleep skews results.
Avoid intense workouts on the morning of your test.
Follow any specific instructions from your doctor or the diagnostic centre.
Minimise stress before the blood draw — acute stress can temporarily raise cortisol.
Understanding Your Results
Normal cortisol levels vary by time of day and lab reference range. Typical values look like this:
These figures can differ slightly between laboratories — always check the reference range printed on your report and discuss results with your doctor. A single abnormal reading doesn't automatically mean disease; stress, illness, sleep, and medications can all influence cortisol.
When Should You Get Tested?
If you're experiencing persistent fatigue, unexplained weight changes, high blood pressure, or mood disturbances, talk to your doctor about whether a cortisol test is right for you. Early detection makes treatment more effective and helps prevent complications.
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Book a Test TodayDisclaimer: This article is for informational purposes only and does not substitute professional medical advice. Please consult a qualified physician for diagnosis and treatment.
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