Embryo culture and replacement

Fertilized eggs are cultured for 1-4 days. During this time the developing embryos are checked regularly to decide on the best day to replace the embryos and which embryos to replace. One or two embryos with the best chance of a pregnancy from the treatment cycle are selected for replacement. The selected embryo(s) are placed in the woman’s uterus under ultrasound guidance using an embryo transfer catheter.