![]() Blood type is inherited, just like hair color.The name Rhesus comes from Rhesus monkeys, in which the protein was first discovered. Rhesus refers to another type of antigen, or protein, on the surface of red blood cells. Blood is either Rh positive (Rh+) or Rh negative (Rh-). The Rh FactorĮach blood type is also grouped by its Rhesus factor, or Rh factor. Antigens are protein molecules found on the surface of red blood cells. Of course, they recognize foreign substances, such as germs, and alert your immune system, which destroys them. They're part of your body's natural defenses. The blood group is identified by antibodies and antigens in the blood. ![]() ![]() Antibodies and antigensīlood is made up of red blood cells, white blood cells and platelets in liquid called plasma. It's just a genetic difference, like having blue eyes instead of green or straight hair instead of curly. Having any of these markers doesn't make a person's blood any healthier or stronger. This blood type has all three types of markers - A, B, and Rh factor. This blood type has A and B markers, but not Rh factor. This blood type has B marker and Rh factor, but not A marker. Along with O positive, it's one of the two most common blood types. This blood type has A marker and Rh factor, but not B marker. O positive blood is one of the two most common blood types. This blood type doesn't have A or B markers, but it does have Rh factor. ![]() This blood type doesn't have A or B markers, and it doesn't have Rh factor. So, there are eight possible blood types: There are more than 600 other known antigens, the presence or absence of which creates "rare blood types." Here is everything you need to know about blood types. Moreover, there is a protein called the Rh factor, which can be either present (+) or absent (–), creating the 8 most common blood types (A+, A-, B+, B-, O+, O-, AB+, AB-). Therefore, there are four major blood groups determined by the presence or absence of two antigens – A and B – on the surface of red blood cells. Since some antigens can trigger a patient's immune system to attack the transfused blood, safe blood transfusions depend on careful blood typing and cross-matching.
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