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The ABO blood group system is the most clinically significant system in transfusion medicine. Although serologic typing for ABO antigens is routine and reliable, molecular methods can be used to predict an ABO type in the absence of a blood specimen as well as to investigate ABO typing discrepancies often caused by ABO subgroups that cause weakened antigen expression, weak or missing serum reactivity, and/or extra red blood cell reactivity. By detecting single nucleotide variants that are hallmarks of the major  ABO  alleles, low-resolution genotyping methods can be used to make allele assignments and predict phenotypes. This approach has become a dependable tool, initially to resolve typing discrepancies identified in blood banks and donor centers and, more recently, to predict the ABO group in bone marrow transplant donors and in deceased donors of solid organs. The aim of this report is to compare two different low-resolution polymerase chain reaction (PCR)-based methods: a PCR-restriction fragment length polymorphism (RFLP) implemented based on a publication and a commercially available TaqMan-based sequence-specific primer-PCR for resolution of ABO typing discrepancies. Fifty-six peripheral blood samples from 31 patients and 25 blood donors were used to isolate genomic DNA and perform genotyping. Results of 49 of the 56 samples (87.5%) were concordant between methods, three samples yielded an unexpected banding pattern on the PCR-RFLP method, and four sample results were discordant between assays. The discordances all involved group A versus A2 discrepancies. Sanger sequencing was used as a high-resolution genotyping method to resolve discrepancies between the two low-resolution methods. This study demonstrates that, in the majority of cases, a low-resolution genotyping method can resolve an ABO discrepancy. Although there is no U.S. Food and Drug Administration–approved genotyping method for ABO determination, molecular testing for investigation of discrepancies is a useful tool for blood banks and transplant programs.

Comparison of ABO genotyping methods: a study of two low-resolution polymerase chain reaction assays in a clinical testing laboratory