What is the basis for determining blood type?
Blood type is usually determined based on the antigen types present on the surface of red blood cells.
The surface of red blood cells contains different antigens. When these antigens bind with corresponding antibodies, they trigger an agglutination reaction. By observing differences in agglutination reactions, the blood type can be identified. According to the classification of blood types, individuals can have type A, type B, type AB, etc. Type A blood refers to red blood cells that carry antigen A on their surface, while type B blood refers to red blood cells carrying antigen B.
In addition to the ABO system, another important blood group system is the Rh blood group system. When testing blood with specific antibodies, if the D antigen is present on the red blood cell membrane, the blood is generally classified as Rh-positive. If the D antigen is absent, it is classified as Rh-negative. Rh-positive blood is relatively common, whereas Rh-negative blood is rare and often referred to as "panda blood."
Furthermore, blood type is typically inherited from one's parents. During testing, blood samples can be collected either from a vein or by a finger prick. For accurate blood typing, individuals are advised to undergo testing at a professional medical facility.