The blastocyst quality of 3BC is medium before a woman has an IVF transfer. When a woman is in need of blastocyst raising before IVF due to her health, a high quality blastocyst is usually selected for transfer. The blastocyst has a higher chance of continuing to lay, grow and develop in the uterine cavity, and therefore can conceive normally. If the quality of blastocyst is low, it is easy to have pre-eclampsia or embryonic abortion after transfer, therefore it will lead to IVF transfer failure. 3 means raising to 3 days embryo, BC means inner cell mass, trophoblast cells, generally AA grade is the best blastocyst, women can also be successful after transfer if only BC embryos are cultured in the process of raising blastocyst. So women can choose better quality embryos for transfer according to their health condition and bladder raising before doing IVF transfer, which can improve the success rate.