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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Classifying ABO Discrepancies

There are different groups or classifications of ABO discrepancies and many specific types within each group. This course will review four broad groups of ABO discrepancies:
    • Group I - Discrepancies that are associated with unexpected reactions in the reverse grouping
    • Group II - Discrepancies that are associated with unexpected reactions in the forward grouping
    • Group III - Discrepancies between forward and reverse grouping caused by protein or plasma abnormalities
    • Group IV - Discrepancies between forward and reverse grouping caused by miscellaneous problems