Comparison Hormone Panel Updated Apr 17, 2026

Cortisol vs Adrenocorticotropic Hormone

Cortisol (Cortisol) and Adrenocorticotropic Hormone (ACTH) are two blood values that appear on the Hormones panel and help describe related parts of hormone signaling. Both can be listed on the same lab report, where Cortisol shows the amount of cortisol in blood and ACTH shows the amount of ACTH in blood. The main difference between Cortisol and ACTH is that Cortisol reflects the output signal, while ACTH reflects the upstream signal that helps drive it.

Cortisol

Cortisol is a steroid hormone made by the adrenal glands and measured in blood tests to show how much Cortisol is circulating at the time of collection. On a lab report, it helps describe hormone balance, time-of-day variation, and how the body is responding to stress, activity, and other factors. Because Cortisol changes across the day, the Cortisol test result is usually interpreted with the collection time and the lab’s Cortisol normal range.

Adult Male mcg/dL
5
23

Adrenocorticotropic Hormone

ACTH

Adrenocorticotropic Hormone (ACTH) is a hormone made by the pituitary gland that helps regulate cortisol production. On a lab report, ACTH measures the amount of this hormone in the blood and is often reviewed with other hormone results. ACTH on a blood test can help describe how strongly the body is signaling the adrenal glands.

Adult Male pg/mL
7.2
63.3

Cortisol (Cortisol) and Adrenocorticotropic Hormone (ACTH) are two lab values that can appear on the Hormones panel and represent related parts of blood chemistry. Cortisol and ACTH on a lab report give two different numbers that belong to the same control system. Cortisol shows the measured cortisol amount, while ACTH shows the measured ACTH amount. Together, they help compare one signal against the other on the same report.

How They Relate

Cortisol measures the concentration of cortisol in blood, while ACTH measures the concentration of adrenocorticotropic hormone in blood. ACTH is the signal that helps stimulate Cortisol release, so the two values often move in opposite directions. When ACTH rises, Cortisol may rise after it; when Cortisol is higher, ACTH may be lower because of feedback control. In a Cortisol vs ACTH comparison, the relationship is about signal and response, not the same substance. The difference between Cortisol and ACTH is therefore both chemical and functional: Cortisol is the downstream value, and ACTH is the upstream value.

Key Differences

Aspect Cortisol Adrenocorticotropic Hormone
What it measures Cortisol level ACTH level
Units µg/dL pg/mL
Typical adult range 6–23 7.2–63.3
Reported as Concentration Concentration
Directly reflects Adrenal output Pituitary signal
How it's calculated Measured directly Measured directly
Common pairing With ACTH With Cortisol

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Reading Them Together

When Cortisol and ACTH are read together, the pair shows how strongly the hormone signal and response line up on the same lab report. A higher ACTH with a higher Cortisol can mean the upstream signal and the response are both active. A higher Cortisol with a lower ACTH can show a stronger feedback effect between the two numbers. If both are low, the report may show reduced activity in the same control pathway. In a blood composition context, the pattern is more important than either number alone.

When Both Are Tested

Cortisol and ACTH are commonly ordered on the Hormones panel and may also appear together on endocrine-focused blood work. They are not part of a CBC, CMP, or lipid panel, but they can be listed on the same report when the lab includes hormone testing. On the Hormones panel, both values help compare signal and response in one place. That makes Cortisol and ACTH useful for viewing related blood measurements side by side.

Frequently Asked Questions

What is the difference between Cortisol and ACTH?
Cortisol is the measured amount of cortisol in blood, while ACTH is the measured amount of adrenocorticotropic hormone in blood. In a Cortisol vs ACTH comparison, Cortisol is the downstream value and ACTH is the upstream signal. The difference between Cortisol and ACTH is shown in both the substance measured and the role each value plays on the report.
Which is more important, Cortisol or ACTH?
Neither value is universally more important because Cortisol and ACTH answer different questions. Cortisol shows the output level, while ACTH shows the signal that helps drive that output. On a lab report, the better choice depends on which part of the hormone system is being reviewed.
Why are Cortisol and ACTH tested together?
Cortisol and ACTH are tested together because the pair shows both the signal and the response in one view. When both numbers are on the same lab report, the pattern can be compared more easily than either value alone. That makes the Cortisol and ACTH relationship easier to read on a blood test.
Can Cortisol be high while ACTH is low?
Yes. That pattern can appear when Cortisol is elevated while ACTH is reduced by feedback control. The opposite pairing can also happen, so the combination matters more than either number alone.
How are Cortisol and ACTH related mathematically?
There is no fixed formula that turns Cortisol into ACTH or ACTH into Cortisol. The relationship is not a simple ratio on a lab report. Instead, the two values are compared as separate measurements that often move in opposite directions.
What units are Cortisol and ACTH measured in?
Cortisol is often reported in µg/dL, while ACTH is often reported in pg/mL. Some labs may use different unit labels or reference ranges, so the exact format can vary by report. The units are listed next to each value on the lab report.
Are Cortisol and ACTH part of the same panel?
They can be. In this case, both Cortisol and ACTH appear on the Hormones panel, so the report shows them together. Other panels such as CBC, CMP, and lipid panel do not normally include both values.
What does high Cortisol with low ACTH usually show on the report?
High Cortisol with low ACTH shows a mismatch between the output value and the upstream signal. On a lab report, that pattern can suggest strong feedback between the two numbers. The key point is the direction of the pair: Cortisol is high while ACTH is suppressed.

Disclaimer

This content is for informational and educational purposes only. It is not intended as medical advice, diagnosis, or treatment recommendation. Reference ranges may vary by laboratory. Always discuss your results with a qualified healthcare professional.