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The page below is a sample from the LabCE course ABO Typing Discrepancies. Access the complete course and earn ASCLS P.A.C.E.-approved continuing education credits by subscribing online.

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Subgroups of B

Subgroups of B are similar to subgroups of A; however, they are rarely encountered in the blood bank. Resolution of these discrepancies may include the following:
  • A thorough review of patient clinical and transfusion history
  • Assessment of the strength of reactivity in the forward and reverse typing
  • Adsorption-elution studies with anti-B
  • Assessment of B substance in salivia
  • Advanced molecular testing