Table 1 P/GLOB-related * blood group... | American Society of Hematology

Table 1

P/GLOB-related* blood group phenotypes and frequencies

Phenotype	Antigen present on red blood cells	Frequency of red blood cell phenotype†
P₁	P1, P^k, P	75%–80%
P₂	P^k, P	20%–25%
p	None	∼ 5 per 10⁶
P₁^k	P1, P^k	∼ 1 per 10⁶
P₂^k	P^k	∼ 1 per 10⁶

Phenotype	Antigen present on red blood cells	Frequency of red blood cell phenotype†
P₁	P1, P^k, P	75%–80%
P₂	P^k, P	20%–25%
p	None	∼ 5 per 10⁶
P₁^k	P1, P^k	∼ 1 per 10⁶
P₂^k	P^k	∼ 1 per 10⁶

According to the International Society of Blood Transfusion working party on terminology of red cell–surface antigens, the P blood group system only contains the P1 antigen, whereas the GLOB blood group system includes the P antigen. The remaining related antigens (P^k and LKE, not mentioned here) are part of the GLOB blood group collection.

†

Phenotypic frequencies are for whites.

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