AMH and Oligomenorrhea: Patients additionally diagnosed by this new diagnostic approach were significantly older and had a higher prevalence of oligomenorrhea and lower prevalence of amenorrhea compared with those diagnosed under the JSOG 2024 criteria.<h4>Conclusion</h4>Applying elevated serum AMH (level 2) based on the Rotterdam/IEBG 2023 criteria improved the diagnostic rate of PCOS, particularly in non-obese/overweight patients and relatively older women with milder PCOS phenotypes.