Which blood type lacks both A and B antigens on red blood cells?

The blood type that lacks both A and B antigens on red blood cells is type O. In the ABO blood group system, type O is characterized by the absence of these antigens. This means that individuals with type O blood do not have A antigens or B antigens on the surface of their red blood cells.

In contrast, type AB blood has both A and B antigens present on the red blood cells. Type A has only A antigens, while type B has only B antigens. Because of this unique combination of lacking both antigens, type O is often referred to as the universal donor for blood transfusions, as it can be given to individuals of any other blood type without the risk of an antigen-antibody reaction from the recipient's immune system.

Understanding the properties of blood types is essential for safe blood transfusions and compatibility testing in medical settings.