Download 2. What Type Of Blood Antigens Are Expressed If A Person Is Ab- Pics. Why doesn't a transfusion reaction occur the first time an rh negative patient is exposed to rh positive blood? A person with ab blood is a universal recipient, that is they can receive blood that is either a, b, ab or o providing the other antigens, eg rh positive/negative, are positive blood types have rhesus antigens, and negative blood types do not.

Blood type tests are done before a person gets a blood transfusion and to check a pregnant woman's blood type.

Blood types in human populations : Usa & world create a pie chart and bar graph to show how blood types vary in. Blood type genes, a, b, and o, determine the presence or absence of an antigen on the surface of red blood cells. A result will normally be expressed as a 1/some number (usually large).