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Understand Progesterone

Progesterone

Hormone markers

What the test generally measures, and what to ask about it.

Longetic keeps every lab and record you’ve had organized and easy to find, so your own Progesterone values sit together on one chart and you walk into your next appointment prepared.

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Updated Jul 13, 2026

What is Progesterone?

A hormone, made mainly by the ovaries, that prepares the uterus for pregnancy and helps support it.

Progesterone rises in the second half of the menstrual cycle after an ovary releases an egg, and it climbs further during pregnancy. In people who menstruate, a rise can be associated with ovulation having occurred, and low levels can be associated with cycles where ovulation did not happen or with early-pregnancy concerns. Because levels change a lot across the cycle and pregnancy, timing matters and results are read in that context. Levels are naturally very low in men and in people who are not pregnant and not near ovulation.

This glossary entry is for informational purposes only and is not a substitute for professional medical advice. Read our Terms of Use.

References

Clinical "Progesterone Test" MedlinePlus (NIH/NLM). medlineplus.gov/lab-tests/progesterone-test.

About our sources

Clinical / professional

Medical societies, specialty colleges, and professional associations whose consensus statements reflect clinical practice standards.

Peer-reviewed research

Original research articles and systematic reviews published in indexed journals and verified through PubMed or DOI.

History of updates

Published · Jul 13, 2026
First published, written and independently fact-checked against the cited sources.

Keep your Progesterone results together in one place

Upload a lab, and Longetic reads it, explains it, and reminds you when it's time to re-check — so nothing slips between visits.