Cortisol — What It Means in Your Blood Test
New to reading lab reports? Start with our guide to reading a blood test report
Cortisol is a hormone that helps your body handle stress and manage energy through the day.
Your Cortisol result captures how much of this hormone was flowing when your blood was drawn. Because the level rises and falls across the day, timing matters when reading it.
Also known as: Hydrocortisone, Serum cortisol, Total cortisol, Stress hormone
This isn't a case where higher or lower is better. Your body keeps it in a narrow band, and both directions can matter.
Last reviewed: 2026-08-16
What is Cortisol?
Cortisol is a steroid hormone from the adrenal glands, which sit above the kidneys. It helps manage energy, immune response, blood pressure, and stress.
Why is Cortisol tested?
You may have this test to check how well the adrenal glands work. It also helps look into signs of too much or too little cortisol.
What is a normal Cortisol range?
- India
- No India-specific national reference interval is published for this parameter; your lab's printed range is the most reliable comparison.
- Global
- Morning (8 AM): 6–23 µg/dL; Afternoon (4 PM): 2–12 µg/dL; Evening: 1–8 µg/dL (strong diurnal variation)
Ranges vary by lab, method and equipment — the range printed on your own report is the one that applies to your result.
Source: [Endocrine Society, 2008]
What does your Cortisol value mean?
There is no widely-accepted set of value bands for this parameter. Compare your result with the reference range printed on your own report, and discuss it with your doctor.
What does a high Cortisol result mean?
A high result can link to overactive adrenal glands, physical or emotional stress, or steroids taken from an outside source. Your doctor can help interpret it.
What does a low Cortisol result mean?
A low result can go with adrenal glands that make too little cortisol. It can also follow turned-down brain signals and is worth discussing with your doctor.
What can affect your Cortisol result?
- Time of day (note a morning or afternoon draw)
- Recent stress, illness, or surgery
- Steroids taken from an outside source
- Poor sleep
- Higher body weight
Questions to ask your doctor
About this result
- What does my Cortisol result mean for me specifically, given my age and health?
- Is my Cortisol in the range that is right for me, not just the lab's general range?
What to do next
- Could anything I eat, do, or take have affected my Stress hormone level result?
- Is there anything I should do about my Cortisol, or is it fine to leave as it is?
About retesting
- Does my Cortisol need to be repeated, and if so, when?
- The typical range for Cortisol can vary between labs — should I compare my result against my own lab's printed range?
The bigger picture
- Should my Cortisol be looked at together with my Total Testosterone and Free Testosterone result?
- Does my Cortisol connect to any condition I already have, or to anything I have noticed in how I feel?
Frequently asked questions
- What is Cortisol?
- Cortisol is a steroid hormone from the adrenal glands, which sit above the kidneys. It helps manage energy, immune response, blood pressure, and stress. You may have this test to check how well the adrenal glands work. It also helps look into signs of too much or too little cortisol.
- What is a normal Stress hormone level range?
- A typical adult range is around Morning (8 AM): 6–23 µg/dL; Afternoon (4 PM): 2–12 µg/dL; Evening: 1–8 µg/dL (strong diurnal variation). No India-specific national reference interval is published for this parameter; your lab's printed range is the most reliable comparison. Ranges vary by lab, method and equipment — the range printed on your own report is the one that applies to your result.
- What does a high Cortisol result mean?
- A high result can link to overactive adrenal glands, physical or emotional stress, or steroids taken from an outside source. Your doctor can help interpret it.
- What does a low Cortisol result mean?
- A low result can go with adrenal glands that make too little cortisol. It can also follow turned-down brain signals and is worth discussing with your doctor.
- What can affect your Cortisol result?
- Several everyday factors can influence it, including Time of day (note a morning or afternoon draw), Recent stress, illness, or surgery, Steroids taken from an outside source, Poor sleep, Higher body weight.
Sources
- Endocrine Society (2008) — The Diagnosis of Cushing's Syndrome: An Endocrine Society Clinical Practice Guideline
- AACE (2017) — AACE Adrenal Incidentaloma Disease State Clinical Review
Part of the Hormones
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