Progesterone for the Prevention of Miscarriage. The PRISM Trial: evidence and recommendations.
nacadmin2026-03-23T20:05:47+00:00The PRISM trial is the largest ever randomised trial in miscarriage prevention; it recruited more than 4000 women from 48 hospitals in the UK. It evaluated the effects of progesterone hormone in women with early pregnancy bleeding. Overall, there was a 3% increase in live birth rate with progesterone, compared with placebo, but the finding was associated with some statistical uncertainty (RR 1.03, 95% CI 1.00 to 1.07, p = 0.08). However, a clear benefit was found for women with the dual risk factors of early pregnancy bleeding and a history of (any number of) previous miscarriages (RR = 1.09, [...]
