Final answer:
In a critical emergency, O negative blood is transfused to maintain blood volume and prevent circulatory shock. Agglutination with both anti-A and anti-B antibodies indicates an AB positive blood type, which is a normal finding.
Step-by-step explanation:
In cases where a patient is experiencing a critical hemorrhage following traumatic injuries and there is no time to determine blood type, type O negative blood is used for transfusion. This is because O negative blood is considered the universal donor and can be safely given to patients of any blood type without the risk of agglutination or other transfusion reactions. This emergency procedure is crucial as it helps maintain blood volume and pressure, providing the patient with necessary oxygen and nutrients to prevent circulatory shock.
Agglutination during blood typing is a normal response that helps determine blood type. If both anti-A and anti-B antibodies cause the blood to agglutinate, the blood type of the patient is AB positive. This indicates the presence of both A and B antigens on the surface of the red blood cells. The technician has not made an error; this is a typical reaction for someone with AB positive blood.