1. It may be that the time of the last menstruation was miscalculated, which led to the discrepancy between the actual gestational age and the expected gestational age.
2. It may be twins or multiple births, because the number of multiple births is higher than that of singletons.
If the above two conditions are confirmed by doctors, then pregnant women don't have to worry.
3. It may be an abnormal pregnancy-hydatidiform mole, and the blood hcg value is usually higher than the normal pregnancy value of the corresponding gestational age.
If hydatidiform mole is diagnosed, it needs to be admitted to hospital immediately.
4. On Down's screening list, the reference range of the median multiple of β-hcg is 0-2.5. If it is higher than this value, it will have a negative impact on the safety of mother and baby during pregnancy. For example, pregnant women are more likely to suffer from pregnancy-induced hypertension, which needs to be judged according to their actual situation. Some pregnant women have been injected with hcg in the early pregnancy to protect the fetus, so it is possible to have a high hCG value when doing Tang screening.