What is RR blood type?

RR blood type refers to the genotype of an individual with two dominant alleles for the Rhesus factor (Rh), which is a protein that can be present on the surface of red blood cells. In the context of the ABO blood group system, it typically indicates that the person is Rh-positive. People with RR genotype will express the Rh factor, meaning they can receive Rh-positive blood without complications. However, the term "RR" is not commonly used in everyday blood typing; instead, blood types are usually classified as A+, A-, B+, B-, AB+, AB-, O+, or O-.