"Advantages of Early Intrauterine Transfer of Blank Culture Medium Prior to 1st or 2nd Transfer of Thawed Embryo(s)."

A maximum of 0.1 ml of gassed embryo culture medium preheated to 37°C is injected into the uterine cavity transcervically using an embryo transfer catheter placed just beyond the internal os, two to 3 days before transfer of the thawed embryo

An intermediate transfer step is added two or three days before the planned transfer of the frozen embryo but with an empty catheter.