The Luteinizing Hormone (LH) test measures the level of LH, a hormone produced by the pituitary gland that is critical for regulating the reproductive system in both men and women. In women, LH triggers ovulation and supports the menstrual cycle, while in men, it stimulates testosterone production. Abnormal LH levels can indicate various conditions, such as polycystic ovary syndrome (PCOS), menopause, or fertility issues. This test is important for anyone looking to assess their reproductive health and hormone balance, especially those experiencing symptoms related to menstrual irregularities or fertility challenges.