A luteinizing hormone test measures how much LH is in your blood. LH helps your reproductive system and is linked to ovulation, puberty, and fertility. Learn why you might need this test, how to prepare for it, and what the normal and abnormal levels mean. Luteinizing hormone (LH) is a hormone produced by the pituitary gland that regulates fertility and reproductive functions in men and women. Learn about the common uses, normal levels and what test results mean for LH, as well as the possible causes and effects of high or low LH levels. If we’re getting technical, luteinizing hormone is a “glycoprotein hormone” (some hormones are proteins, some are classified as steroids, and this one just happens to be a protein). It’s released by a small part of the brain called the pituitary gland, at the same time as follicle-stimulating hormone (FSH). A luteinizing hormone (LH) test is a blood or urine test that measures the levels of LH in a person's blood. This hormone plays a key role in the reproductive system of both males and females ...
