If a patient has blood type AB and type AB antigen, which type of donor blood can they receive safely?

A patient with blood type AB possesses both A and B antigens on their red blood cells. This unique combination allows them to receive blood from any ABO blood type without the risk of an immune reaction.

When considering blood transfusions, it is crucial to match not only the blood type but also the antigens present. Since AB blood type individuals have both A and B antigens, they do not produce anti-A or anti-B antibodies. This means they can accept donor blood that carries A antigens, B antigens, or both, which applies to types A, B, AB, and O.

Type O blood is often regarded as the universal donor because it lacks A and B antigens, making it safe for any recipient. However, since the question specifically pertains to a type AB individual, they can safely receive blood from all listed types: O, A, B, and AB. This characteristic makes type AB the universal recipient in the context of blood transfusions.

Therefore, the correct answer encompasses all possible blood types that a type AB patient can receive without adverse reactions, confirming that the patient can safely receive Type O, A, B, and AB blood.