Blood test for pregnancy is a pregnancy test with high accuracy, mainly by detecting the level of HCG in women’s blood to determine whether a woman is pregnant or not. Women who normally have regular menstruation are advised to go to the hospital in time to check whether they are pregnant or not if they have delayed menstruation after having intercourse without measures. After intercourse, if the egg and sperm combine to form a fertilized egg, the fertilized egg will gradually enter the uterine cavity through the fallopian tube and implant in the endometrium after 6-7 days, the trophoblast cells will proliferate and start to secrete HCG. Women with HCG <5IU/L in the non-pregnant state, if the test result shows blood HCG >5IU/L, it indicates possible pregnancy and the HCG value increases exponentially when the test is repeated. In addition, ectopic pregnancy and gravida can also lead to elevated blood HCG. If a woman experiences abdominal pain and vaginal bleeding after menopause, or if the increase in HCG value is not obvious, she should be alert to the possibility of ectopic pregnancy, which can be identified by ultrasound examination. A blood test for pregnancy can be performed without an empty stomach. Before the test, keep a happy mood and avoid alcohol and smoking. After a woman determines that she is normally pregnant, she should pay attention to having pregnancy checkups on time, which can confirm the development of the fetus, help pregnant women understand their physical condition, facilitate their body conditioning during pregnancy, and help the fetus grow and develop in a healthy way.