Luteal Phase Support in Intrauterine Insemination Cycles: A Randomized Clinical Trial of Vaginal Versus Intramuscular Progesterone Administration.

Background: Different progesterone doses and routes are used for luteal phase support in stimulated intrauterine insemination (IUI) cycles, but the optimal supplementation scheme has not yet been determined. Therefore, our aim was to compare the administration of two different doses of vaginal progesterone with two doses of intramuscular (IM) progesterone for luteal phase support in patients undergoing IUI cycles.

Methods: In this randomized clinical trial, 312 women with unexplained or malefactor infertility intending to start IUI cycles between April 2015 and January 2018 were included.