We had a grouping discrepancy for a patient where forward group reactions were all positive including the Rh control.
Patient's original group was A positive but we had weak reactions with Anti-A and A1 cells.
(washed patient cells 4 times with RT saline and repeated group, same reactions)
The antibody screen was positive including the autocontrol. Dat and eluate all positive. So we thought it's a warm auto and send it to our reference lab for investigation.
They performed adsorption with zzap'd cells and there was no clinically significant antibody detected in ads