Frozen embryo transfer (FET) refers to a procedure in which previously frozen embryos are later thawed and then transferred into the uterus. A patient can undergo a FET cycle in order to try for another child or, if the previous transfer from the fresh IVF/ICSI cycle was unsuccessful. The FET procedure is not preceded by ovarian stimulation, but sometimes preparatory treatment of the uterine lining is required. In some cases, your doctor will advise testing when the uterus is most susceptible to embryo attachment before transferring a frozen embryo. The susceptibility of the inner surface tissue of the uterus or endometrium can be tested using beREADY and ERA tests.
Embryo transfer is a short procedure in which a doctor transfers pre-thawed embryos into the uterus using a thin catheter. In Estonia, it is allowed by law to transfer up to 3 embryos per one procedure, but we usually recommend transferring only 1 embryo (in rare cases 2) in order to reduce the risks arising from multiple pregnancies. In the course of embryo transfer it is also possible to use EmbryoGlue. This is a transplant solution that can be used to promote the attachment of the embryo to the uterus and thus increase the success of the pregnancy.