A blood draw is able to check for pregnancy, and the test is blood beta-hCG (chorionic gonadotropin). When the blood β-hCG<3.1U/L, suggests not pregnant; when the blood β-hCG>5.0U/L, suggests that there is a possibility of pregnancy; when the blood β-hCG>25U/L, is positive for pregnancy. HCG is a glycoprotein hormone secreted by trophoblast cells, which can be measured in maternal serum about one day after the fertilized egg is deposited, thus it becomes the earliest and the most sensitive method to diagnose pregnancy. Since it is taken from maternal peripheral blood, the test result is not affected by objective factors. In early pregnancy, blood β-hCG should multiply by more than 66% per day. An increase of less than 66% for more than 48 hours suggests the possibility of poor embryonic development or ectopic pregnancy. When a sexually active woman has a blood β-hCG test, she should see a specialist with the test results to determine if she is pregnant. Do not take the results of the test without authorization, as this may result in a bad outcome.