Partial Rupture Syndrome (PRS)

By RRM Academy Reviewed by Dr. Naomi Whittaker, MD, Board-Certified OBGYN, MIGS, NFPMC, FCI Updated May 7, 2026

Partial Rupture Syndrome (PRS) is an ovulation disorder in which the dominant follicle collapses by 7.5 mm or less over a 24-hour period, releasing the oocyte incompletely rather than fully rupturing.⁷⁸

PRS occupies a specific position in Hilgers' sonographic classification of ovulation disorders. It is distinct from Luteinized Unruptured Follicle Syndrome, in which the follicle does not rupture at all, and from Delayed Rupture Syndrome, in which complete collapse extends across 48 hours. In PRS, rupture initiates but stalls: follicular diameter decreases, but the collapse is insufficient to fully expel the oocyte-cumulus complex.⁷⁸

The corpus luteum that forms from a partially ruptured follicle is structurally compromised. Subnormal corpus luteum function follows, with reduced progesterone output across the post-Peak phase. Fecundity in affected cycles is reduced even when the CrMS chart appears to show normal ovulation timing.

Diagnosis requires serial follicle maturation study ultrasound with measurements at 24-hour intervals across the periovulatory window. Chart observation alone cannot distinguish PRS from a normal ovulatory cycle. Imaging names the defect. Restorative protocols then address it at its source.

This content is for educational purposes only and does not constitute medical advice. Consult an RRM clinician or healthcare provider for guidance specific to your situation.