Follicle Stimulating Hormone (FSH) LabCorp
This test measures FSH levels to identify various conditions, including hypogonadism in men and infertility in women and men.
What is this test?
The Follicle Stimulating Hormone (FSH) Test measures FSH in the blood to diagnose conditions in men and women.
FSH is a hormone secreted by the pituitary that performs various important functions. In men, FSH controls sperm production. In women, it regulates the menstrual cycle and supports the growth of eggs in the ovaries.
Low levels of FSH in men can indicate primary and secondary hypogonadism (low Testosterone) along with potential infertility. High levels of FSH in men can indicate an issue with the testes, which causes the pituitary gland to produce more FSH to compensate.
Abnormally low FSH levels in women can indicate infertility, since FSH triggers the creation of eggs in the ovaries. It can also point to potential issues with the pituitary. Abnormally high FSH levels in women can indicate the beginning of menopause and a reduced number of eggs and follicles in the ovaries.
Who is this test for?
This test is for women and men who want insight into their fertility. This test can also be useful for men who are experiencing hypogonadal symptoms, because it can be help differentiate between primary hypogonadism (low Testosterone caused by a problem with the testes) and secondary hypogonadism (low Testosterone caused by a secondary condition like pituitary disease). This test can help women understand whether they have entered menopause, as well.
The FSH Test is often ordered with the Luteinizing Hormone (LH) Test because they are both gonadotropins (hormones that stimulate the gonads) with interlinked functions.
For patients looking to diagnose a potential Testosterone deficiency, the FSH Test is included in the Men’s Comprehensive Wellness Panel, which measures several other important indicators of hypogonadism. Testing FSH alone typically is not enough to diagnose low Testosterone.
