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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.

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