In vitro HCG normal value reference range, in early pregnancy HCG appears to double up every other day, different pregnancy time HCG value varies. The HCG range is 50-500 IU/L in the second week of pregnancy and around 100-5000 IU/L in the third week of pregnancy. It is better to have regular blood tests to check the value of blood HCG, according to the value of HCG, the development of embryo can be judged, if the HCG is low, it is easy to cause miscarriage, and it is better to treat with reasonable supplementation of progesterone under the guidance of doctor. At the same time, it is recommended to strengthen nutrition, pay attention to rest, and after IVF, it is better to have regular maternity checkups to see the development of the fetus. To ensure sufficient sleep, do not stay up late, do not eat spicy and stimulating food, it is recommended to eat high-quality protein such as lean meat, fish, shrimp, eggs, etc., to eat fresh vegetables and fruits, which can supplement the protein and vitamins during pregnancy, and to reasonably supplement folic acid in early pregnancy.