The 17-Hydroxyprogesterone test measures the level of 17-hydroxyprogesterone, a hormone produced by the adrenal glands and ovaries that plays a key role in the production of cortisol and other steroid hormones. The test is typically done by drawing a blood sample, which is then analyzed to measure the amount of 17-OHP in the bloodstream. This test is primarily used to diagnose congenital adrenal hyperplasia (CAH), a genetic disorder that affects adrenal hormone production, as elevated levels of 17-OHP are often indicative of this condition. It is also used to assess adrenal gland function and investigate symptoms such as irregular menstrual cycles, infertility, early puberty, or signs of adrenal insufficiency. The 17-OHP test is commonly administered when CAH or other adrenal disorders are suspected, especially in newborns, children, or individuals presenting with unexplained hormonal imbalances.