An HCG value of 21 IU/L does not confirm that you are pregnant, it only means that there is a higher chance of pregnancy. HCG is the abbreviation of human chorionic gonadotropin, and its value is very important in determining whether a woman is pregnant. Normal HCG test in women is generally 0-10IU/L, but the reference range is different in each hospital, if the test result exceeds the upper limit, consider pregnancy, it is recommended to go to the hospital for a comprehensive examination to determine if you are really pregnant. HCG increase in addition to suggesting pregnancy, some pathological conditions will also appear HCG manifestations, such as glucose, teratoma, so HCG value of 21IU / L, it is recommended to go to the hospital for a comprehensive examination to determine whether it is really pregnant. A comprehensive examination can not only determine whether the fetus is healthy or not, but also learn about the health of the pregnant woman herself. Every pregnant woman should pay attention to do a good job of prenatal checkups during pregnancy, and actively listen to the advice of professional doctors to do a good job of comprehensive care and health care, which can effectively ensure the safety of the delivery.