Final answer:
Thawing fresh frozen plasma at 37°C before transfusion is an example of proper transfusion practices. In emergencies, O-negative blood is used because it is the universal donor type. Agglutination with both anti-A and anti-B antibodies indicates an AB blood type.
Step-by-step explanation:
An example of proper transfusion practices regarding fresh frozen plasma is B) Thawing at 37°C before transfusion. Fresh frozen plasma should be thawed at a controlled temperature to prevent the breakdown of clotting factors and to ensure it is ready for rapid infusion when required. Prolonged storage of fresh frozen plasma should be at temperatures of -18°C or lower to maintain long-term storage stability. It should not be mixed with packed red blood cells prior to transfusion due to the risk of adverse reactions and should not be infused rapidly at room temperature without first being adequately thawed.
In emergencies such as a motor vehicle accident with severe bleeding, when there is no time to determine the patient's blood type, the universal donor blood type, which is O-negative, is transfused due to its compatibility with all other blood types. This is largely because O-negative blood does not have the A, B, or Rh antigens that could be recognized as foreign by the recipient's immune system. For patients with known blood types, cross matching ensures compatibility between donor and recipient.
If blood samples agglutinate with both anti-A and anti-B antibodies, this indicates that the patient has AB blood type, which is a normal response and does not indicate an error on the technician's part.