Rh Blood Group Flashcards
Most complex of all rbc blood group system
Rh
Is the most important rbc antigen in transfusion reaction
D antigen after A and B
Who lack d ag do not have
Anti D
Antibody produced through expiosure to D Ag through what
Oregnancy or transfusion
This is greater than that of all otehr rbc Ag studied
Immunogenicity D
Is routinely performed so D neg will be transfused with D
Testing for D
That delivery of stull born and adverse reaction in mom to blood transfusion from father were related discovered by
Levine and stetson 1989
Syndome in fetus is called
Hemolytic disease of the fetus and newborn
Syndrome had complicated oregnanciea for decades causing severe jaundice and death
Erthroblastosis fetalis
Suggestied that Ag are determined by
3 pairs of genes which occupy closely linked loci
Eqch gene causes priduction of antige exceot
d
Three loci carry the rh gene are so closely linked that they never separate but are passed from generation to generation ws a unit or gene complex
Fisher race
Nan offspring of Dce/dce individual will inherit either dce or Dce from the parent never
dCe
The gene complex DCe woukd cause priduction of
D C and e ag
If one chromosome carried DCe and other was DcE would cause
D,C,c,E,e ag
Each ag is recognizable by testing red cell with specific ag except
d
Each gene produces a structure on the red cell called
Agglutinogen or Ag
What are the 8 major allelespostulated that twi genes one or each chromosomes pair controls the entire express of Rh system
Wiener
The two theories are the basis for the twi notation currently used for the rh system
Wiener and fisher race
Convert Dce fisher race into wiener
R0
Most common D positive genotype
R1r
Most common D genotype
rr
Refer to genes
Superscript Rh upper 1
Refers to agglutinogen
Subscript Rh below 1
Proposed a nomnclature based ibky on serologic reaction
Rosenfield 1962
This are numbered in order of their discovery and recognition as belonging to the rh system
Ag
ISBT measn
International society of blood transfusion
004001
D Ag
004
Rh
For recording of phenotypes the sytem adopts
Rosenfield approach
Agglutination reaction pos and neg will represent the
Phenotype
Statistical probability to determine most probable
Genotype
Uses of Rh phenotyping
Parenting testing
Predicting HDN
Conforming Rh Ab
Locationg compatible blood for receipient with rh ab
Is the result of the reaction between the red cell and antisera
Phenotype
Genetic make up and can be predicted using the phenotype and considering the race
Genotype
Three mechanism for weak D
Mosaic
Position effect
Genetic
Inherit weak D or position effect
Quantitative
Mosaic D could produce Anti D
Qualitative
Is the most important blood grouo system after ABO in transfusio medicine
Rh
Inherited from parents in linked fashion as
Haplotypes
Below an offspring of the dce/Dce individual will inherit eithe dce or Dce from the present neve dce as this would indicate crossing over which does niy occur in rhy system in man
Fisher race
Stimulated as a resukt of transfusion or preg they are immune
Rh ab
Ab accounts for majority of unexpected ab encountered
Rh antigens
That control the system are
Autosomal condominant chrom 1