What is the benefit of embryo culture and transfer at blastocyst stage?
Once IVF program had completed its stimulation part, oocyte retrieval will be performed. Eggs and sperms will be put together and cause fertilization, fertilized egg will develop and become embryo. • Day 1 embryo will be at pronuclei stage • Day 2 embryo will be at 4 cell stage • Day 3 embryo will be at 8 cell stage Day 4 embryo will be at morula stage • Day 5 embryos will be at blastocyst stage In order to raise embryo up to day 5, you need a skillful embryologist and sophisticated laboratory. Once the embryo reaches blastocyst stage and the quality is good, then the chance of pregnancy after smooth embryo transfer may be as high as 40%. But if you have very good day 3 or 4 embryos for transfer, the chance of pregnancy is also as high as 35-40%. So the benefit of blastocyst transfer is to reduce number of embryos replaced and still maintain high chance of pregnancy. The appropriate number of embryo replacement for any women less than 38 years old should be 2 and for anyone older shoul
