Blood group universal donor refers to individuals with type O-negative blood. Their red blood cells lack both A and B antigens, the markers that trigger immune responses in recipients with other blood types. This makes O-negative blood compatible with all other blood types, allowing O-negative individuals to donate their blood to anyone in need.
Blood group universal donors are vital in emergency situations and for people with rare blood types who require transfusions. The ability to receive blood from O-negative donors without experiencing immune reactions makes it a valuable resource in the medical field.