Along with cephalosporins, for AHIA, watch for cefotetan administration pre-c-section. We had a situation where post c-section delivery the patient developed severe anemia Hgb <5.0 gm/dl. She had been given penicilin G post delivery, Cephalosporin, Aldomet (both given during the pregnancy) and Cefotetan. We sent her specimen out for testing and they found antibodies to penicillin and Cephalosporin that were weak. The also found that she had a strong reacting antibody to cefotetan. After searching her chart, we found one notation that cefateton in the anesthesia notes being given pre-c-section. Our Anesthesiologist indicated that cefatetan pre-c-section is quite common. The reference lab BB Specialist, says that when they see severe hemolysis post c-section, they often find antibodies to Cefatetan. I believe there are articles on this written by Garatty that explain the mechanism.