Final answer:
Erythrocytes with Rho[D] antigen present indicate that a person is Rh positive. Rh positive or negative status is determined by the presence or absence of this antigen, independent of the ABO blood group.
Step-by-step explanation:
Erythrocytes with Rh D antigen are found in a person who is Rh positive. The Rh blood group is categorized by the presence or absence of this specific erythrocyte antigen. Individuals who have this antigen present on their erythrocytes, which is about 85% of Americans, are known as Rh positive (Rh+). Conversely, those who lack the Rh D antigen are referred to as Rh negative (Rh-). It's important to note that this Rh factor is separate from the ABO blood group system.