An HCG value of 21 IU/L indicates a higher likelihood of pregnancy, but does not confirm that you are pregnant. HCG values are usually greater than 25 IU/L to be able to determine that you are pregnant. HCG refers to human chorionic gonadotropin. HCG is a hormone composed of glycoproteins secreted by the trophoblast cells after pregnancy, which can provide the material basis and guarantee for the fetus to make the pregnancy go smoothly. Normal women in the test HCG is 0 ~ 5IU / L, if more than the upper limit of the reference range, consider the possibility of pregnancy, but can not be definitively diagnosed. In addition, HCG can be significantly elevated in some pathological conditions, such as suffering from malignant staphyloma, choriocarcinoma, etc. HCG can also be tested positive. If the HCG value is 21IU/L, it is recommended to consult a doctor in time, and under the doctor’s guidance, further improve the relevant examinations to clarify whether you are pregnant or not, and whether the status of pregnancy is normal.