The Inhibin-A test is a highly specialized marker for both prenatal screening and ovarian health. 1) For Prenatal Care: It is a key component of the 'Quadruple Marker Test' in the second trimester, helping to assess the risk for chromosomal conditions. 2) For Ovarian Health: It is a specialized 'tumor marker' used by doctors to help diagnose and, most importantly, monitor a rare type of ovarian tumor (granulosa cell tumor). A simple blood draw is required. This advanced test provides critical, specific data to guide your specialist's care and provide the deepest possible insights.