Which patient data reflects the discrepancy when a person's red cells demonstrate the acquired-B phenotype?

The acquired-B phenotype is a rare condition where a person's red blood cells express the B antigen due to an infection or other transient factors, even though their serum may not contain anti-B antibodies, or they may have a different underlying ABO phenotype.

In the case of patient B, the forward grouping shows AB, meaning that the patient's red cells are expressing both A and B antigens. However, the reverse grouping shows A, indicating that the patient's serum is only reacting with A antigens and not with B antigens. This discrepancy demonstrates a classic example of acquired-B phenomenon, where the red cells appear as AB due to the presence of the B antigen, but the serum lacks anti-B antibodies usually expected in an individual who has a true AB phenotype.

This mismatch between the forward and reverse grouping highlights the confusion that can arise from atypical presentations of ABO blood types, such as when transient expressions of antigens occur due to environmental or pathological influences. The other options do not adequately illustrate a discrepancy that would indicate the acquired-B phenotype, as they either show expected reactions or consistent typing results.