ABO Blood Grouping Blood Typing. ABO Basics Blood group antigens are actually sugars attached to the red blood cell. Antigens are “built” onto the red.

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Presentation transcript:

ABO Blood Grouping Blood Typing

ABO Basics Blood group antigens are actually sugars attached to the red blood cell. Antigens are “built” onto the red cell. Individuals inherit a gene which codes for specific sugar(s) to be added to the red cell. The type of sugar added determines the blood group.

ABO Type Frequencies In U.S. ABO TypePer Cent O45% A40% B11% AB4%

Landsteiner’s Rule Individual’s will form immune antibodies to ABO blood group antigens they do not possess. Critical for understanding compatibility between ABO blood groups.

Inheritance Blood group antigens are “codominant”, if the gene is inherited, it will be expressed.

Genetics Two genes inherited, one from each parent. Individual who is A or B may be homozygous or heterozygous for the antigen. Heterozygous: AO or BO Homozygous: AA or BB Phenotype is the actual expression of the genotype, ie, group A

Example of Determining Genotype Mom’s phenotype is group A, genotype AO Dad’s phenotype is group B, genotype BO BO AAB 25%AO 25% (Group A) OBO 25% (Group B)OO 25% (Group O)

Other Examples MomDadOffspring Blood Group AABB100% AB BOOO50% each of B or O OO 100% O OOAO50% each of A or O

Group O Approximately 45% of the population is group O. No A or B antigens present, think of as “0” antigens present. These individuals form potent anti-A and anti-B antibodies which circulate in the blood plasma at all times.

Group A Approximately 40% of the population is group A. No B antigens present. These individuals form potent anti-B antibodies which circulate in the blood plasma at all times.

Group B Approximately 11% of the population is group B. No A antigens present. These individuals form potent anti-A antibodies which circulate in the blood plasma at all times.

Group AB Approximately 4% of the population is group AB. Both A and B antigens present. These individuals possess no ABO antibodies. NOTE: This slide is in error as it only illustrates presence of one antigen not 2.

Hemolysis If an individual is transfused with an incompatible blood group destruction of the red blood cells will occur. This may result in the death of the recipient.

Summary Blood GroupAntigens on cellAntibodies in plasma Transfuse with group AAAnti-BA or O BBAnti-AB or O ABA and BnoneAB, A, B or O ONoneAnti-A & BO

Rh (D) Antigen Of next importance is the Rh type. Rh is a blood group system with many antigens, one of which is D. Rh refers to the presence or absence of the D antigen on the red blood cell.

Blood Typing There are 2 components to blood typing: Test unknown cells with known antibodies Test unknown serum/plasma with known rbc’s The patterns are compared and the blood group is determined.

Summary of Slide Typing Anti-AAnti-BBlood Group NEG O POSNEGA POSB AB