How are the Rotterdam Criteria different from other diagnostic criteria?
Prior to the Rotterdam Criteria, the most commonly used diagnostic criteria were the National Institutes of Health (NIH) criteria established in 1990. The NIH criteria required the presence of both oligo- or anovulation and hyperandrogenism for a PCOS diagnosis. The Rotterdam Criteria broadened the definition to include polycystic ovaries on ultrasound as an additional diagnostic criterion, thereby recognizing a more diverse spectrum of PCOS manifestations.
