AMH and polycystic ovary syndrome: We have established a new mathematical model for diagnosing PCOS using serum AMH and androstenedione levels, UML, and BMI, with AUC values of 0.855 (0.838–0.870), 0.848 (0.791–0.891), 0.846 (0.812–0.875) in the training, validation, and testing sets, respectively.