diagnosis of genetic disorders is 1%. although no studies are known to account for all cases of prom that stem from amniocentesis. this case, the chances of the membranes healing on their own and the amniotic fluid returning to normal levels is much higher than spontaneous prom. compared to spontaneous prom, about 70% of women will have normal amniotic fluid levels within one month, and about 90% of babies will survive. epidemiology of term pregnancies (more than 37 weeks) about 8% are complicated by prom, 20% of these become prolonged prom. about 30% of all preterm deliveries (before 37 weeks) are complicated by pprom, and rupture of membranes before viability (before 24 weeks) occurs in less than 1% of all pregnancies. since there are significantly fewer preterm deliveries than term deliveries, the number of pprom cases make up only about 5% of all cases of prom.