Oligo-Ovulation means infrequent ovulation. Most women have an ovulation every 21 to 35 days. In case of oligo-ovulation or infrequent ovulation, the cycle duration is more than 35 days, or less than 8 cycles per year.
- Jefferson University Hospitals. Ovulation Disorders. https://hospitals.jefferson.edu/diseases-and-conditions/ovulation-disorders.html (accessed 8. August 2020)
- Rebar R. Evaluation of Amenorrhea, Anovulation, and Abnormal Bleeding. Endotext. https://www.ncbi.nlm.nih.gov/books/NBK279144/ (accessed 8. August 2020)