Skip to Content
Home > Wellness > Health Library > 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
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.
Current as of:
May 22, 2015
Sarah Marshall, MD - Family Medicine & Kirtly Jones, MD - Obstetrics and Gynecology
To learn more about Healthwise, visit Healthwise.org.
© 1995-2015 Healthwise, Incorporated. Healthwise, Healthwise for every health decision, and the Healthwise logo are trademarks of Healthwise, Incorporated.
I Want To...
Our interactive Decision Points guide you through making key health decisions by combining medical information with your personal information.
You'll find Decision Points to help you answer questions about:
Get started learning more about your health!
Our Interactive Tools can help you make smart decisions for a healthier life. You'll find personal calculators and tools for health and fitness, lifestyle checkups, and pregnancy.
Feeling under the weather?
Use our interactive symptom checker to evaluate your symptoms and determine appropriate action or treatment.