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Understand Prolactin

Prolactin

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 Prolactin values sit together on one chart and you walk into your next appointment prepared.

Summarize with AI
Updated Jul 13, 2026

What is Prolactin?

A pituitary hormone whose main job is to help breast tissue grow and make milk during and after pregnancy.

Prolactin is made by the pituitary gland and is normally high in pregnancy and breastfeeding but low in men and non-pregnant women. When higher than expected in those groups, it can be associated with a benign pituitary growth called a prolactinoma (the most common cause), certain medicines, an underactive thyroid, or kidney disease, and can affect periods, fertility, and sex drive. Because stress, exercise, meals, and sex can nudge prolactin up temporarily, a single high reading is not a diagnosis and follow-up testing is common.

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

References

Clinical "Prolactin Levels" MedlinePlus (NIH/NLM). medlineplus.gov/lab-tests/prolactin-levels.

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.

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