Blastocyst, also known as blastocyst transfer, is more accurate when blood is drawn on the 10th day. Fertilization of sperm and egg in a test tube, a blastocyst is formed when 6~7 cells are divided in the test tube, a blastocyst may be implanted 2~3 days after the blastocyst transplantation, and the blastocyst will gradually secrete human chorionic gonadotropin after the success of the blastocyst transplantation, and the amount of hormone secretion will change from less to more, and then the blood and urine will reach the level that can be detected to determine whether the blastocyst is successfully transplanted or not. Generally in about 10 days of blastocyst transplantation, you can draw blood to check HCG for pregnancy test, each hospital has different testing instruments, and the units used in the test are also different, for example, HCG is less than 5IU/L to exclude pregnancy, more than 10IU/L is basically sure that you are pregnant, and more than 20IU/L is completely sure that you are pregnant. After blastocyst transfer, it is recommended to go to regular hospital to detect pregnancy, the accuracy of blood test will be higher, and go to the hospital to do ultrasound examination about 42 days after successful transplantation to see whether there is the development of germ and fetal heart. After blastocyst transfer, pay more attention to rest, try to avoid excessive exertion.