Aim: The progesterone’s optimal route for luteal phase support (LPS) in frozen-thawed embryo transfer (FET) cycles is controversial. This study investigates the effect of three treatment regimens progesterone: vaginal, oral, and subcutaneous form LPS FET cycles.
 Material Method: Blastocyst cryopreserved utilizing subcutaneous, or oral forms progesterone between December 2018 May 2020 were...