Pregnant blood test for what?

If you want to check if you are pregnant, blood can be tested HCG, also known as human chorionic gonadotropin, should be 7 days after cohabitation, fertilized eggs will show increased values during implantation. If there is no pregnancy, HCG values will be less than 5IU/L; after pregnancy, HCG values greater than 5IU/L, this value will show changes every day, every other day doubled growth, indicating that the gestational sac is well developed, need to confirm pregnancy, every other day to review. Under normal circumstances, in the second week or so, the level of human chorionic gonadotropin in the blood will double, which is a normal performance. This value can only judge the development of pregnancy sac, but can not determine whether intrauterine pregnancy or ectopic pregnancy, if you want to judge intrauterine pregnancy, it is best to pass B ultrasound examination, is more accurate.