Human blood is typed Rh⁺ (positive blood) or Rh^- (negative blood). This Rh factor is called an antigen. There are two other antigens known as A and B types. Blood lacking both A and B types is called type O. In Problem 60 of Section 2.3, you were asked to sketch a Venn diagram showing the three types of antigens A, B, and Rh. One possible diagram is shown in Figure 2.18.

Figure 2.18

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Blood types Type A A 4+ Type B AB- AB+/ B- B+ 0+ Rh factor 0- Recipient Blood Types A+ B+ AB+ A B AB O Donor Blood Types A+, A, 0, 0- B+, B, 0, 0- A+, A, B+, B, AB, AB, O, 0 0, 0- A, O B, O A, B, AB, 0 O