Published online by Cambridge University Press: 16 April 2025
Progesterone is an endogenous hormone which is derived from cholesterol steroids. It is secreted in women principally by the corpus luteum in the ovaries during normal menstrual cycles. Progesterone exerts a number of essential effects vital for the support and maintenance of a pregnancy. The role of progesterone in threatened and recurrent miscarriage was a matter of debate for many decades, until the findings of the PROMISE and PRISM trials. Vaginal micronized progesterone may increase the live birth rate for women with a history of one or more previous miscarriages and early pregnancy bleeding, with likely no difference in adverse events. There remains an uncertainty over the effectiveness and safety of alternative progestogen treatments for threatened and recurrent miscarriage.
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