May mask a significant haemolytic reaction. Leaked potassium causes rouleaux during grouping. Forty five minutes. Further testing confirmed that he was indeed the father. The blood group was incorrect due to premature birth.
Mother carries both the A and B gene on the same chromosome.
The only possible explanation is that the father is not the genetic father. Group A with warm autoantibody. Subgroup of A with anti-A 1 . Antibodies to acriflavine, the dye in the anti-B reagent. Sub group of B. Alloantibody.