What PCOS actually is
PCOS is diagnosed clinically, not by an ultrasound alone. The current criteria rest on three findings: irregular or absent ovulation, clinical or laboratory evidence of elevated androgens, and polycystic ovarian morphology on imaging. Two of the three, with other causes excluded, support the diagnosis. That exclusion step matters, because thyroid disease, elevated prolactin, and non-classic adrenal hyperplasia can imitate the same picture and are managed differently.
