Types of Blood Group & Their Compatibility


In fact, everyone’s blood contains the same basic elements. But not every bloods are alike. They all different from each other with different common blood types. Blood types are determined by the presence or absence of certain antigens.

The ABO Blood Group System

  • Group A – has only the A antigen on red cells (and B antibody in the plasma)
  • Group B – has only the B antigen on red cells (and A antibody in the plasma)
  • Group AB – has both A and B antigens on red cells (but neither A nor B antibody in the plasma)
  • Group O – has neither A nor B antigens on red cells (but both A and B antibody are in the plasma)

blood groups

Rh Factor

The Rh factor is simply a protein that is found on the covering of the red blood cells. If your red blood cells have this protein, you are Rh positive. If your blood cells don’t have this protein, you are Rh negative.

Just as everyone inherits ABO genes, every person inherits one Rh factor gene from each parent. The Rh-positive gene is the dominant gene when paired with an Rh-negative gene.

Parent Genes Negative/Negative Positive/Postive Negative/Positive
Negative/Negative Neg/Neg Neg/Pos Neg/Neg, Neg/Pos
Positive/Positive Neg/Pos Pos/Pos Neg/Pos, Pos/Pos
Negative/Positive Neg/Neg, Neg/Pos Neg/Pos, Pos/Pos Neg/Neg, Neg/Pos, Pos/Pos

Neg/Neg = Negative Rh factor

Neg/Pos = Postive Rh factor

Pos/Pos = Positive Rh factor

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