GNRH1 and spontaneous abortion: Of note, participants undergoing a long GnRH protocol OS appeared to benefit more from progesterone free LPS such as IMHCG in view of increased live birth, OR 1.57 (95% CrI 2.24 to 71.9) and reduced miscarriage events, OR 1.57 (95% CrI 2.24 to 71.9).