DESCRIPTION: The Inhibin B Immunoassay is a diagnostic test designed to quantitatively measure inhibin B levels in human serum or plasma. Inhibin B, a glycoprotein hormone secreted primarily by ovarian granulosa cells in females and Sertoli cells in males, plays a pivotal role in regulating follicle-stimulating hormone (FSH) and is a key marker of reproductive function. Its measurement offers critical insights into fertility, ovarian function, and certain clinical conditions.