The Follicle Stimulating Hormone (FSH) test measures the level of FSH, a hormone produced by the pituitary gland that plays a crucial role in regulating the reproductive processes in both men and women. In women, FSH is essential for ovarian function and egg development, while in men, it aids in sperm production. Abnormal FSH levels can indicate various reproductive issues, including menopause, infertility, or pituitary disorders. This test is vital for anyone seeking to understand their reproductive health and hormone balance, particularly those experiencing fertility challenges or menstrual irregularities.