As is well known, prenatal check ups are very important, which not only provide an understanding of the baby's condition, but also enable the pregnant woman to have a thorough understanding of her own condition. In daily life, some people metaphorically say, 'Pregnancy is like leveling up and fighting monsters in a game, passing five levels and killing six generals!' However, the difference is that during monster fighting, blood needs to be constantly replenished. So, how many times do we need to draw blood during prenatal check ups?

Normally, at least three blood tests are required during prenatal check ups, but due to different situations among pregnant women, the tests performed may vary. Therefore, the number of blood draws during prenatal check ups varies from person to person.
But generally speaking, the first blood test is taken during the first prenatal examination, mainly for blood routine examination, to check whether the pregnant woman has anemia, infection or poor coagulation function, any of which may endanger the health and safety of the baby and pregnant woman. The second blood draw is to check for Down syndrome screening, mainly to screen for malformed infants. If there are abnormalities in the examination, amniocentesis or non-invasive DNA testing is needed for further confirmation in the later stage. The third blood sampling is to check the sugar screen, in order to confirm whether the pregnant woman has pregnancy with diabetes.
In addition, if the pregnant woman also has a blood test during the prenatal examination, it may be to check the liver and kidney functions, or check for syphilis, AIDS, hepatitis B (HBV) and other viruses. In summary, pregnant women should follow medical advice carefully when undergoing prenatal and blood tests, as doctors are the ones who have the best understanding of a pregnant woman's physical condition.