IS HORMONE REPLACEMENT FOR ENDOMETRIAL PREPARATION ASSOCIATED WITH PREGNANCY LOSSES IN FROZEN-THAWED SINGLE-BLASTOCYST TRANSFER CYCLES

Frozen-thawed embryo transfer (FET) cycles have become an integral part of IVF treatment, coinciding with the improvement of freezing programs and an increase in the elective single-embryo transfer policy [1]. While endometrial preparation may be achieved by a natural or hormone replacement method, an optimal approach has not yet been clearly defined [2, 3].