A luteinizing hormone (LH) blood test measures the amount of LH in the blood. LH is a hormone produced by the pituitary gland that plays a key role in the menstrual cycle and fertility. In women, LH helps regulate the menstrual cycle and triggers the release of an egg from the ovary (ovulation). In men, LH stimulates the production of testosterone. A luteinizing hormone blood test can be used to diagnose conditions such as polycystic ovary syndrome (PCOS), ovarian failure, and delayed puberty. It may also be used to help determine the cause of infertility in both men and women.
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