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Progesterone

Published: July 27, 2026Updated: August 25, 2026

Progesterone is a hormone that plays a crucial role in the menstrual cycle, pregnancy, and embryogenesis. It is primarily produced in the ovaries, placenta, and adrenal glands.

Quick summary

Progesterone is essential for reproductive health and pregnancy maintenance.

Medically reviewed by WellAlly Editorial TeamLast reviewed August 25, 2026Editorial policy

Key facts at a glance

Units
ng/mL
Clinical utility
diagnostic
Result kind
quantitative
FDA-cleared
Roche Progesterone, Abbott Progesterone, Siemens Progesterone
interpretation: {"text":"Low progesterone levels may indicate anovulation, luteal phase defect, or potential miscarriage risk.","label":"Low"}; {"text":"High progesterone levels are normal during pregnancy but may suggest ovarian cysts or certain hormone-producing tumors otherwise.","label":"High"}

Progesterone is a steroid hormone that is vital for the menstrual cycle, pregnancy, and the development of the embryo. It prepares the uterus for pregnancy and supports fetal development.

Levels of progesterone fluctuate throughout the menstrual cycle, peaking during the luteal phase after ovulation. During pregnancy, progesterone levels rise significantly to support the placenta and fetus.

Abnormal progesterone levels can indicate issues such as infertility, miscarriage risk, or ovarian dysfunction. Monitoring progesterone is crucial for managing reproductive health and fertility treatments.

Frequently asked questions

What is a normal progesterone level?
Normal progesterone levels range from 0.1 to 25 ng/mL, depending on the phase of the menstrual cycle and pregnancy status.
How is progesterone testing used?
Progesterone testing is used to evaluate fertility, confirm ovulation, diagnose pregnancy complications, and monitor hormone therapy.
  1. 1
    Mayo Clinic: Progesterone TestSource
  2. 2
    American College of Obstetricians and Gynecologists: Progesterone and ProgestinsSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 25, 2026. · Read our editorial policy