Diagnostic tests

Luteinizing hormone blood test

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.

This page is provided for educational and informational purposes only and does not constitute the provision of medical advice or professional services. The information provided should not be used for diagnosing or treating a health problem or disease, and those seeking personal medical advice regarding any of the tests and conditions referenced above are advised to consult with a licensed clinician. Always seek the advice of your qualified health provider regarding a medical condition and do not disregard professional medical advice or delay in seeking it because of any information on this page. If you think you may have a medical emergency, immediately call 911 or go to the nearest urgent care center or hospital.

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