The main benefit of embryo freezing is that it allows the replacement of embryos in later treatment cycles without the need for ovarian stimulation and egg collection.The survival rate of frozen - thawed embryo in our program is around 90 - 95 % and 85 % for further embryo development. The replacement of frozen embryos is preferably carried out after treatment with hormone replacement therapy. The artificial cycle has been shown to be beneficial both in terms of results and in keeping monitoring to a minimum. The actual day of transfer can also be planned in advance for optimum convenience.