ACTH — What It Means in Your Blood Test
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This hormone tells the adrenal glands to make cortisol, the main stress hormone.
Your ACTH result shows how strongly the brain's small gland is nudging the glands above your kidneys. Read together with a partner hormone, it helps point toward where a problem may begin.
Also known as: Adrenocorticotropic hormone, Corticotropin, Adrenocorticotropin, Corticotrophin
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 ACTH?
ACTH is released by the pituitary, a small gland under the brain. It travels through the blood to the adrenal glands and switches on cortisol production there.
Why is ACTH tested?
You may have this test, usually with cortisol, to find the source of a cortisol problem. It helps tell a pituitary cause from an adrenal one.
What is a normal ACTH 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): 7–63 pg/mL (varies by lab; afternoon values are lower due to diurnal rhythm)
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, 2016]
What does your ACTH 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 ACTH result mean?
A high result can link to adrenal glands that make too little cortisol, or to a source outside the pituitary making ACTH. Your doctor can help interpret it.
What does a low ACTH result mean?
A low result with a high cortisol can point to adrenal glands making cortisol on their own. It can also follow steroids taken from an outside source. This is worth discussing with your doctor.
What can affect your ACTH result?
- Time of day (peaks in the early morning)
- Recent physical or emotional stress
- Steroids taken from an outside source (they lower it)
- Sample handling (it breaks down fast and needs cold transport)
- Your sleep and wake pattern
Questions to ask your doctor
About this result
- What does my ACTH result mean for me specifically, given my age and health?
- Is my ACTH 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 Adrenal-stimulating hormone level result?
- Is there anything I should do about my ACTH, or is it fine to leave as it is?
About retesting
- Does my ACTH need to be repeated, and if so, when?
- The typical range for ACTH can vary between labs — should I compare my result against my own lab's printed range?
The bigger picture
- Should my ACTH be looked at together with my Total Testosterone and Free Testosterone result?
- Does my ACTH connect to any condition I already have, or to anything I have noticed in how I feel?
Frequently asked questions
- What is ACTH?
- ACTH is released by the pituitary, a small gland under the brain. It travels through the blood to the adrenal glands and switches on cortisol production there. You may have this test, usually with cortisol, to find the source of a cortisol problem. It helps tell a pituitary cause from an adrenal one.
- What is a normal Adrenal-stimulating hormone level range?
- A typical adult range is around Morning (8 AM): 7–63 pg/mL (varies by lab; afternoon values are lower due to diurnal rhythm). 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 ACTH result mean?
- A high result can link to adrenal glands that make too little cortisol, or to a source outside the pituitary making ACTH. Your doctor can help interpret it.
- What does a low ACTH result mean?
- A low result with a high cortisol can point to adrenal glands making cortisol on their own. It can also follow steroids taken from an outside source. This is worth discussing with your doctor.
- What can affect your ACTH result?
- Several everyday factors can influence it, including Time of day (peaks in the early morning), Recent physical or emotional stress, Steroids taken from an outside source (they lower it), Sample handling (it breaks down fast and needs cold transport), Your sleep and wake pattern.
Sources
- Endocrine Society (2016) — Diagnosis of Adrenal Insufficiency: Endocrine Society Clinical Practice Guideline
Part of the Hormones
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