Information about a laboratory test
Progesterone changes markedly throughout pregnancy and rises across gestation; a single nonpregnant reference range is not appropriate.
Measures progesterone, produced mainly by the ovaries and, during pregnancy, increasingly by the placenta.
Used with other clinical information to assess ovulation, infertility, and selected pregnancy-related questions.
The meaning of low progesterone depends on cycle timing or gestational stage; one low result alone does not predict a pregnancy outcome.
High progesterone is physiologic after ovulation and during pregnancy; labeling it 'high' without cycle context can be misleading.
Use the reference interval printed on your own laboratory report first. Hormone results may vary with the assay, age, sex, pregnancy, menstrual-cycle phase, and sampling time.
< 1 ng/mL
Example reference interval
This is an example interval from the cited source. Menstrual-cycle phase, menopause, and pregnancy can materially affect reproductive-hormone results.
>= 5 – <= 20 ng/mL
Example reference interval
This is an example interval from the cited source. Menstrual-cycle phase, menopause, and pregnancy can materially affect reproductive-hormone results.
< 1 ng/mL
Example reference interval
This is an example interval from the cited source. Menstrual-cycle phase, menopause, and pregnancy can materially affect reproductive-hormone results.
< 1 ng/mL
Example reference interval
This is an example interval from the cited source. Menstrual-cycle phase, menopause, and pregnancy can materially affect reproductive-hormone results.
>= 11.2 – <= 90 ng/mL
Example reference interval
This is an example interval from the cited source. Menstrual-cycle phase, menopause, and pregnancy can materially affect reproductive-hormone results.
>= 25.6 – <= 89.4 ng/mL
Example reference interval
This is an example interval from the cited source. Menstrual-cycle phase, menopause, and pregnancy can materially affect reproductive-hormone results.
Reference ranges may vary by laboratory, method used, age, sex, pregnancy status, and clinical context. The reference range on your own laboratory report takes precedence.
Cycle phase, pregnancy status, and trimester are core context fields for progesterone. The same number can have very different meaning at different times.
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Estrogen Levels Test — U.S. National Library of Medicine (MedlinePlus)
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Progesterone Test — U.S. National Library of Medicine (MedlinePlus)
Government medical reference · 2025 · Progesterone use in ovulation, fertility and pregnancy · Verified: Aug 11, 2026
Serum progesterone — U.S. National Library of Medicine (MedlinePlus)
Government medical encyclopedia · 2025 · Cycle- and trimester-specific example progesterone values · Verified: Aug 11, 2026
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