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BACKGROUND: The first successful pregnancy from a frozen-thawed embryo transfer (FTET) was reported in 1983 and after more than three decades, significant changes have been introduced into clinical practice. OBJECTIVE: To compare endometrial preparation for frozen thawed embryo transfer (FTET) in supplemented natural cycle (NC) by hCG (human chorionic gonadotropin) versus HRT (hormonal replacement therapy) by estrogen and progesterone in regularly cycling women. METHODS: A prospective trial was conducted on 40 patients that were divided into two treatment groups. The first group underwent endometrial preparation by supplemented natural cycle by HCG, and the second group underwent endometrial preparation by HRT (estrogen and progesterone). RESULTS: No significant difference was revealed between the two groups regarding ongoing clinical pregnancy rate. CONCLUSION: This study concluded that there is no significant difference in clinical pregnancy rate between the two methods of endometrial preparation for frozen thawed embryo transfer; supplemented natural cycle by hCG or HRT by estrogen and progesterone, in regularly cycling women.

Endometrial Preparation for Frozen Embryo Transfer by Supplemented Natural Cycle versus Hormone Replacement Cycle in Regularly Cycling Women