HCG refers to human chorionic gonadotropin, a hormone that can be used to determine pregnancy. In the early stages of pregnancy, there is a significant increase in HCG in the pregnant woman’s body, which can be used to diagnose pregnancy through a significant increase in urine and blood tests. After pregnancy has been confirmed, the test is still needed, and in the early stages of pregnancy, the value may appear to double. If there is a significant decrease in this value, it is considered that the patient may have a pre-eclampsia or miscarriage, and the possibility that the embryo has stopped growing is not excluded.