Royal Prince Alfred Hospital
Fertility Unit
Royal Prince Alfred Hospital

Frozen Embryo Transfers

What is a frozen embryo transfer?

Following an IVF cycle, there are sometimes one or more good quality embryos which can be frozen and kept in storage for future use. A cryo-stored embryo cycle is shorter and less involved than a stimulated IVF cycle, as we do not need to stimulate the ovaries to collect your eggs. Instead, using drugs, ovulation is suppressed and the lining of the uterus is thickened to match the stage of the embryo's development. 

Who is it for?

Women who have undergone a stimulated IVF cycle and have extra embryos that were suitable for freezing. Women who have been at risk of hyperstimulation during an IVF cycle and have had all of their embryos frozen. Women who have had an IVF cycle to store embryos prior to chemotherapy. Women who are using embryos created from donor eggs.

Drugs used in a cryo cycle

  • Ethinyl Estradiol tablets to prevent spontaneous ovulation
  • Progesterone pessaries to thicken the lining of the uterus

Possible complications

Failure to suppress ovulation, embryo does not survive the freeze-thawing process, bleeding, infection, biochemical pregnancy, ectopic pregnancy, miscarriage and  multiple pregnancy.