Final answer:
The most important question to ask after a motor vehicle crash is about the speed of the vehicle to gauge injury severity. In an emergency with no time for blood type testing, O negative blood is transfused because it is the universal donor type. Agglutination with both anti-A and anti-B antibodies indicates AB positive blood type.
Step-by-step explanation:
The most important question to ask a patient who has been involved in a motor vehicle crash, especially when considering immediate medical treatment and assessment, is C. How fast was the vehicle going? This information is crucial for understanding the potential severity of the patient's injuries. High-speed collisions are more likely to result in significant trauma, which may affect the urgency and type of medical interventions required.
In cases where there is severe bleeding and the patient's blood type is not known, the type of blood transfused is usually type O negative. This is because type O negative is considered the universal donor and can be given to patients of any blood type without the risk of an adverse reaction. The emergency use of O negative blood is a critical intervention to maintain blood volume and oxygen delivery to tissues until the patient can be stabilized and their blood type determined.
When a patient's blood sample agglutinates with both anti-A and anti-B antibodies, it indicates that the patient has type AB positive blood, which means they have both A and B antigens on the surface of their red blood cells. This is a normal response for individuals with AB positive blood and is not an error by the technician.