Blood type tests are not just for blood transfusions. There are various other functions of knowing which blood type we have. Knowing your blood type is important because it is related to the interests of various medical measures, even those related to life safety. At least, there are about four to six liters of blood in the human body. The blood consists of red blood cells, white blood cells, and platelets. In addition, certain protein molecules called antigens and antibodies also exist in human blood. Antigen is a protein molecule that is on the surface of red blood cells, while antibodies are proteins found in blood plasma. Antigens are of two types, namely antigen A and antigen B. The presence or absence of the two antigens can affect a person's blood type or type, namely A, B, AB, or O. Not only that, the presence or absence of rhesus (Rh) factor in blood can also determine human blood type. Rhesus factor (Rh) is an inherited protein found on the surface of red blood cells...