Diagnostic criteria for polycystic ovary syndrome 1. sporadic ovulation or anovulation 2. clinical manifestations of hyperandrogenism and/or hyperandrogenemia 3. polycystic ovarian changes: ≥ 12 follicles of 2-9 mm diameter in one or both ovaries and/or ovarian volume ≥ 10 ml 4. 2 of the above 3 criteria are met and other causes of hyperandrogenism are excluded: congenital adrenocortical hyperplasia, Cushing’s syndrome, androgen-secreting tumors, etc.