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
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.
Sarah Marshall, MD - Family Medicine & Kirtly Jones, MD - Obstetrics and Gynecology
The Health Encyclopedia contains general health information. Not all treatments or services described are covered benefits for Kaiser Permanente members or offered as services by Kaiser Permanente. For a list of covered benefits, please refer to your Evidence of Coverage or Summary Plan Description. For recommended treatments, please consult with your health care provider.