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    Luteinizing Hormone (LH)

    Luteinizing Hormone (LH)

    Luteinizing hormone (LH) is produced by the pituitary gland. In women, LH helps regulate the menstrual cycle and egg production (ovulation); in men, LH stimulates the production of testosterone, which plays a role in sperm production.

    Women's LH levels normally vary with the phase of the menstrual cycle, rapidly increasing just before ovulation occurs. This "LH surge" is a dependable sign that a woman is in a fertile time of her cycle. Men's LH levels normally remain constant.

    Abnormally high or low LH levels can be a sign of an inability to produce eggs or sperm.

    Last Revised: June 8, 2012

    Author: Healthwise Staff

    Medical Review: Sarah Marshall, MD - Family Medicine & Kirtly Jones, MD - Obstetrics and Gynecology

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