Generally, blood types are obtained with the assistance of professional doctors and instruments, and thus you cannot simply distinguish blood types by yourself at home. However, you can make use of the characteristics of blood type to simply infer your own blood type from your parents’ blood type, or you can go to the relevant medical institutions for blood type testing, which can obtain accurate results. the ABO blood group system includes four types: A, B, O and AB. For example, if both parents have O blood type, the child can only have O blood type. If one parent has O blood type and the other parent has A blood type, the child may have A blood type and O blood type. If one parent is A and the other is B, the child may be A, B, O, or AB. If one parent has blood type O and the other parent has blood type B, the child may have blood type B and blood type O. If one parent has blood type B, the child may have blood type B and blood type O. If both parents have blood type B, the child may have blood type B and O. If both parents have blood type B, the child may have blood type B and O. If one parent is B and the other is AB, the child may be B, A, or AB. If one parent is type O and the other is type AB, the child may be type A, B. If both parents have AB blood type, the child may only have AB blood type. If both parents are blood type A, the child can only be blood type A. If both parents are blood type A, the child can only be blood type A. If the parents’ blood type is also unclear, and you still want to clarify your own blood type, it is recommended to go to a professional medical institution to have your blood type tested. In clinical practice, the blood type is mostly determined by drawing blood and testing it. The method is to put a drop of peripheral blood in two sera, anti-A and anti-B, and then determine the blood type by observing whether there is any agglutination reaction between the two sera. For example, if the anti-A and anti-B sera are agglutinated, the blood type is AB. If the blood within the anti-A and anti-B sera is not agglutinated, then the blood type is O. If anti-A agglutinates and anti-B does not agglutinate, the blood is type A. If anti-A does not agglutinate and anti-B agglutinates, the blood type is B.