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Understand Luteinizing Hormone (LH)

Luteinizing Hormone (LH)

Hormone markers

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

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Updated Jul 13, 2026

What is Luteinizing Hormone (LH)?

A pituitary hormone that triggers ovulation in women and helps the testicles make testosterone in men.

LH is made by the pituitary gland and works closely with FSH; in women a mid-cycle surge triggers release of an egg, and in men it signals the testicles to produce testosterone. It is interpreted by sex and, in menstruating women, by cycle timing, and is usually measured together with FSH. Higher LH can be associated with the ovaries or testicles not working normally (including menopause) or conditions such as PCOS; lower LH can be associated with a pituitary or hypothalamus problem. A result is only meaningful alongside symptoms and other hormone levels.

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References

Clinical "Luteinizing Hormone (LH) Levels Test" MedlinePlus (NIH/NLM). medlineplus.gov/lab-tests/luteinizing-hormone-lh-levels-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.

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