Final answer:
Type O negative blood is typically transfused to patients in critical condition with severe bleeding when there is no time to determine their blood type.
Step-by-step explanation:
In the case of a patient who is rushed to the emergency department with severe bleeding and no time to determine their blood type, they are typically given a transfusion of type O negative blood. This is because type O negative blood is considered the universal donor, meaning it can be given to patients of any blood type without causing an adverse reaction. It is important to note that this is an emergency measure and further testing will be conducted to determine the patient's actual blood type for any subsequent transfusions.