North American Registry of Midwives (NARM) 2026 – 400 Free Practice Questions to Pass the Exam

The statistic indicating that approximately 80% of women at or near term will start labor spontaneously within 24 hours following premature rupture of membranes is grounded in clinical studies and observations in obstetric practice. When membranes rupture prematurely, the body is often already prepared for labor due to hormonal changes that have been occurring as pregnancy approaches term. This readiness for labor, combined with the natural oxytocin production that follows the rupture of membranes, enhances the likelihood that contractions will begin, thus prompting spontaneous labor.

This high percentage reflects the body's innate mechanisms designed to initiate labor once the membranes are compromised, as it signals readiness for delivery. Therefore, many women experience the onset of labor more quickly than anticipated in this situation. Understanding this statistic is critical in midwifery practice and helps inform management of cases involving premature rupture of membranes, including monitoring expectations for labor onset and assessing the need for any interventions.