Modified natural frozen embryo transfers seem to give us the highest rates of success but more data is needed.

It seems that use of letrozole (Femara) during modified natural embryo transferers results in lower pregnancy rates.

Expected FHT per embryo is based on SART data live birth rates for female age and embryo day (day5, day 6, or day 7).

Awadalla MS, Ho JR, McGinnis LK, Ahmady A, Cortessis VK, Paulson RJ. Embryo morphology and live birth in the United States. F&S Reports. 2022 Jun 1;3(2):131-7.

This research has been approved by the Christ Hospital IRB (protocol #25-030).