This hospital s supplier has only O positive platelets in stock. Dr. Jones ordered a Type and Screen on Paul a 30 year-old preoperative patient. The patient tested O positive with a negative antibody screen. Previous records show that this patient tested positive for anti-Fy a 2 years ago. Eight of ten units crossmatched for John, a white male patient, are incompatible at immediate spin saline.
Antibody screens with enzyme-treated reagent cells are negative, but regular screens are positive.
Screens were negative at all phases. Suggest three causes for this incompatibility. Blood Products 18. Two units of blood were returned from the operating room in a cooler. List four findings that indicate that a unit of RBCs should be rejected for transfusion.