The Androstenedione (ANST) Enzyme Immunoassay is a diagnostic test used to measure levels of androstenedione, a precursor to testosterone and estrogen, in serum or plasma. Androstenedione plays a key role in the production of sex hormones and is important for understanding adrenal and gonadal function. This assay provides insights into conditions such as adrenal disorders, polycystic ovary syndrome (PCOS), and other hormonal imbalances. Clinicians use this test to evaluate androgen levels and monitor treatment for hormone-related conditions.