Oligomenorrhea is the medical term for infrequent menstrual periods, specifically fewer than six to eight periods per year. Another definition for oligomenorrhea is a cycle duration between 35 days and 6 months. It is considered a menstrual disorder, and PCOS is one of the key reasons for oligomenorrhea.
- Welt C.K. et al. Absent or irregular periods (Beyond the Basics). UpToDate. https://www.uptodate.com/contents/absent-or-irregular-periods-beyond-the-basics (accessed 8. August 2020)
- Burgers J.A et al. Oligoovulatory and Anovulatory Cycles in Women with Polycystic Ovary Syndrome (PCOS): What’s the Difference? The Journal of Clinical Endocrinology & Metabolism, Volume 95, Issue 12, 1 December 2010, Pages E485–E489. https://academic.oup.com/jcem/article/95/12/E485/2835423
- Cleveland Clinic. Abnormal Menstruation (Periods). https://my.clevelandclinic.org/health/diseases/14633-abnormal-menstruation-periods (accessed 8. August 2020)