This test measures the level of follicle-stimulating hormone (FSH) and luteinizing hormone (LH) in your blood. FSH helps regulate the production of eggs in women and sperm in men. LH is a hormone produced by the pituitary gland that helps regulate the menstrual cycle and ovulation in women and helps regulate testosterone production in men. This test can help diagnose issues with fertility, menstrual irregularities, and other hormone-related conditions.