Hormone Panel Updated Apr 17, 2026

17-Hydroxyprogesterone (17-OHP)

17-Hydroxyprogesterone (17-OHP) is a steroid hormone made in the adrenal glands and ovaries or testes. On a blood test, it helps show how much of this hormone is circulating and how it compares with the 17-Hydroxyprogesterone normal range. The 17-OHP test is often reviewed as part of a hormone panel, where high 17-OHP or low 17-OHP can reflect differences in hormone production or timing of the sample.

What Is 17-Hydroxyprogesterone (17-OHP)?

17-Hydroxyprogesterone (17-OHP) is a steroid hormone measured in blood. It is made in the adrenal glands and, in smaller amounts, in the ovaries or testes. A 17-Hydroxyprogesterone on a blood test shows how much of this hormone is circulating at the time of the sample and is reported as a 17-Hydroxyprogesterone test result.

Why Is 17-Hydroxyprogesterone (17-OHP) Tested?

The 17-OHP test is usually ordered as part of a hormone panel, not a routine chemistry panel like a CMP or lipid panel. It is used to give a snapshot of steroid hormone production and how that result fits with other hormone markers. In a 17-Hydroxyprogesterone on a lab report, the value helps describe hormone balance alongside related test results. The full name, 17-Hydroxyprogesterone, is often shortened to 17-OHP on lab reports.

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17-Hydroxyprogesterone (17-OHP) Normal Range

Group Range Unit
Adult Male 27–199 ng/dL
Adult Female 15–70 ng/dL

Reference ranges may vary by laboratory and individual factors.

What Does High 17-OHP Mean?

A high 17-OHP result means more 17-Hydroxyprogesterone is circulating than expected for the reference interval. In a 17-Hydroxyprogesterone test result, high 17-OHP is often interpreted as increased steroid precursor production or slower conversion into other hormones. Values above the 17-Hydroxyprogesterone reference range, such as above about 200 ng/dL in many adult blood test settings, are commonly considered high 17-OHP, although the exact cutoff depends on the lab method and timing of the sample. When someone asks what does 17-OHP mean, the answer depends on the rest of the hormone panel and the collection conditions.

Associated factors

Timing of collection — 17-OHP follows daily variation, so a morning sample can read higher than later in the day.
Physical stress or recent exercise — temporary hormone shifts can raise 17-OHP for a short period.
Hydration status — lower plasma volume can concentrate the measured 17-OHP in the sample.
Pregnancy — hormone production changes can increase 17-OHP compared with nonpregnant values.
Certain medications — steroids and some hormone-active medicines can change 17-OHP production or conversion.
Natural sex variation — adult male and adult female patterns can differ because baseline hormone production differs.
Age-related variation — 17-Hydroxyprogesterone on a blood test can shift across life stages as hormone output changes.
Laboratory method differences — immunoassay and mass spectrometry methods may not match exactly, changing the reported 17-OHP value.

What Does Low 17-OHP Mean?

A low 17-OHP result means less 17-Hydroxyprogesterone is circulating than expected for the reference interval. In a 17-Hydroxyprogesterone test result, low 17-OHP can reflect reduced steroid precursor production, faster conversion into downstream hormones, or a sample taken under conditions that shift hormone levels downward. Values below the 17-Hydroxyprogesterone normal range, such as below about 20 ng/dL in many adult blood test settings, are commonly considered low 17-OHP. The exact interpretation depends on the assay, collection time, and the rest of the hormone panel.

Associated factors

Time of day — later-day collection can show lower 17-OHP than a morning sample.
Improved hydration — higher plasma volume can dilute the measured 17-OHP concentration.
Certain medications — some hormone therapies can lower circulating 17-OHP.
Dietary pattern — very low intake or major calorie restriction can shift steroid production.
Natural sex variation — adult male and adult female reference patterns are not identical.
Age-related variation — lower baseline steroid output can reduce 17-Hydroxyprogesterone on a blood test.
Laboratory method differences — the reported 17-OHP can be lower or higher depending on the assay used.
Sample handling — delays or processing differences can affect the final 17-OHP test result.

How 17-Hydroxyprogesterone (17-OHP) Relates to Other Values

17-OHP is often read with other hormone markers from the same panel to build a fuller picture of steroid production. Related values may include progesterone, cortisol, androstenedione, and testosterone, which help show how hormone pathways connect. When 17-Hydroxyprogesterone on a lab report is reviewed alongside these markers, the pattern can show whether the measured hormone is part of a broader shift in steroid output. The 17-Hydroxyprogesterone reference range is also interpreted with the collection time and assay type in mind.

What Factors Affect 17-Hydroxyprogesterone (17-OHP) Levels?

Age, sex, and life stage can shift the 17-Hydroxyprogesterone normal range because steroid production changes over time. Time of day matters, since 17-OHP can vary across the day. Hydration can change the measured concentration by affecting plasma volume. Pregnancy and recent exercise can also move the 17-Hydroxyprogesterone test result up or down. Different lab methods and reference intervals can make one 17-OHP result not directly comparable with another from a different lab.

How It Is Tested

The 17-OHP test is done on a blood sample, usually drawn from a vein in the arm. The laboratory measures the amount of 17-Hydroxyprogesterone in the sample and reports a 17-Hydroxyprogesterone test result. Common units are ng/dL or nmol/L, depending on the lab.

How to Prepare

No fasting is usually required for a 17-OHP test unless the ordering panel includes other tests with different instructions. Because 17-Hydroxyprogesterone on a blood test can vary by time of day, collection timing may matter for comparison across tests.

Frequently Asked Questions

What is a normal 17-OHP level?
A normal 17-OHP level is the value that falls inside the lab’s 17-Hydroxyprogesterone normal range for that sex, age, and test method. For many adult labs, adult male values are about 27 to 199 ng/dL and adult female values are about 15 to 70 ng/dL. The reference interval on the report is the best match for the specific 17-OHP test.
What does 17-OHP stand for?
17-OHP stands for 17-Hydroxyprogesterone. It is a steroid hormone measured on a 17-OHP test or 17-Hydroxyprogesterone test. On a blood test, it appears as a numeric result with a unit such as ng/dL or nmol/L.
What does a high 17-Hydroxyprogesterone mean on a lab report?
A high 17-Hydroxyprogesterone result means the measured value is above the 17-Hydroxyprogesterone reference range for that lab. In a 17-OHP on a blood test, high 17-OHP can reflect increased hormone precursor production, collection timing, or assay differences. The exact meaning depends on the rest of the hormone panel and the sample conditions.
What does a low 17-Hydroxyprogesterone mean on a lab report?
A low 17-Hydroxyprogesterone result means the measured value is below the expected 17-Hydroxyprogesterone normal range for the lab. A 17-OHP test result can read low because of time of day, hydration, medication effects, or natural variation in steroid output. The number is most useful when compared with the reference interval printed on the report.
Can hydration affect 17-Hydroxyprogesterone?
Yes, hydration can affect 17-Hydroxyprogesterone on a blood test by changing plasma volume. More fluid in the bloodstream can make the measured 17-OHP concentration look lower, while lower plasma volume can make it look higher. This effect is one reason a 17-OHP test is best compared under similar collection conditions.
What is the difference between 17-Hydroxyprogesterone and progesterone?
17-Hydroxyprogesterone and progesterone are related but not the same. Progesterone is a downstream steroid, while 17-OHP is a precursor in the same hormone pathway. When both are listed on a hormone panel, the combination helps describe how steroid production is moving through the pathway.
What unit is 17-Hydroxyprogesterone measured in?
17-Hydroxyprogesterone is commonly measured in ng/dL, and some labs report it in nmol/L. The unit on the 17-OHP test result matters because the same numeric value means something different in each unit system. The lab report should always be read with the printed unit and reference range.
How much can 17-Hydroxyprogesterone change between tests?
17-Hydroxyprogesterone can change between tests because of time of day, hydration, recent exercise, and laboratory method. Small shifts are common, and the same person may get slightly different 17-OHP results on different days. A comparison is most useful when the sample timing and lab method are similar.
Is 17-Hydroxyprogesterone different for men and women?
Yes, 17-Hydroxyprogesterone normal range values can differ for adult males and adult females. This reflects different baseline steroid production patterns. The lab report should list the correct reference interval for the person being tested.
Why is 17-Hydroxyprogesterone tested in a hormone panel?
17-Hydroxyprogesterone is tested in a hormone panel to show where steroid production fits within the larger hormone picture. The 17-OHP test is often read with progesterone, cortisol, androstenedione, and testosterone. Together, these markers help describe the flow of hormone production in blood.

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.

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