Dear Galvania, Thanks for reply. Yes, I really don't know whether she can develop anti-A1, and made me confuse. To update information, we received her new sample after the one in question. Forward and Reverse reaction were the same, but antibody screening was 1+ reaction in cell III (We use Abtectcell III 0.8%), and DAT was negative. Then we put the panel (We use Diamed panel), but the panel was negative. To make it more complicated was when we knew that she was admitted for LSCS, before we can get either bombay or parabombay blood, we try to get some compatible units if possible, for emergency. Our plan is we will crossmatch with A pos units, again cross match was incompatible. However, we got one unit O pos compatible. That's weird. Fortunately, we got two bombay units for her and more fortunately, her pregnancy was delivered safely.