E-Freeze Trial: Fresh vs Frozen Embryo Transfers

E-Freeze is a multi-centre randomised controlled trial that compares fresh embryo transfer with frozen thawed embryo transfer for couples undergoing their first, second or third round of fertility treatment. The main aim of E-Freeze is to understand if there is any difference in the chance of having a healthy baby.

Some studies suggest that using frozen thawed embryos may lead to improved pregnancy rates. This is because when frozen embryos are used, this allows time for the excess hormones of ovarian stimulation to wear off and for the uterus to return to its natural state. E-Freeze will compare these two types of embryo transfer in 1,086 couples.

This is a UK wide trial, and Oxford Fertility are one of 14 sites, along with Nurture Fertility.

https://www.npeu.ox.ac.uk/e-freeze