Blood donor universal donor refers to an individual whose blood can be transfused into people with any blood type. This is because their blood lacks the A and B antigens, which are proteins that trigger an immune response in people with different blood types. Universal donors have type O-negative blood, which is compatible with all other blood types.
Universal donors are important because they can provide blood for transfusions in emergency situations when the patient’s blood type is unknown. They are also valuable for people with rare blood types who may have difficulty finding compatible blood.