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Exam (elaborations)
TEAS Version 7 Science Section 
Practice 2026–2027: Comprehensive 
Study Guide, Test Bank & Practice 
Questions 

A trauma patient requires an immediate red blood cell transfusion, but there is insufficient time to determine the patient’s ABO blood group. Ignoring the Rh factor, which blood group is considered the universal red blood cell donor? 
A.	Type A 
B.	Type B 
C.	Type AB 
D.	Type O 
Correct Answer: D. Type O 
Rationale: Type O red blood cells lack both A and B surface antigens, making them least likely to trigger an ABO incompatibility reaction. Type A cells carry A antigens, type B cells ca...