In general, it is normal for HCG to drop to roughly 5 ml/U or less after treatment for hyperemesis gravidarum. The time it takes for the HCG to fall to normal after staph clearance is about 9 weeks and up to 14 weeks. This is due to physical fitness and the severity of the condition. Serum HCG measurement is the most important auxiliary examination in the process of diagnosing hyperemesis gravidarum, if there is hyperemesis gravidarum, then the HCG value will be significantly higher than the value of the normal gestational week, which can be used as a judgment of normal pregnancy. At the same time, blood HCG can also be used as a follow-up identification in the course of the treatment of gravidarians, to determine the situation and extent of the treatment of gravidarians. After the evacuation of the hyperemesis gravidarum, HCG needs to be checked once a month for 6 months, and then once every 2 months for 6 months. If an abnormality is detected in the middle of the process, then it is advisable to seek prompt medical attention to rule out a trophoblastic tumor.