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Aim. Aim of the study was to the effectiveness of various endometrial preparation protocols in IVF frozen embryo transfer cycles. Materials and methods. The study included 288 women, which were stratified into two groups depending on the onset of pregnancy: group 1 pregnancy + (n=92), group 2 pregnancy - (n=196). Then endometrium preparation features were evaluated. Results. The pregnancy rate after frozen-thawed embryo transfer was a bit higher in the natural menstrual cycle (41.2%) compareddoi:10.26442/20795696.2020.2.200093 fatcat:n5e5fyipvvb4hnqvirikyhreke