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WAEC Biology 2018 Question 39

Question 39

Transport in Animals

Two unconscious patients X and Y whose blood group genotypes are AO and AB respectively were transfused with blood from the same donor. Patient X immediately showed signs of difficulty in breathing while patient Y showed no negative reaction. What should the hospital have done to prevent patient X from showing the symptom described above? Patient X should have

  1. A.undergone an agglutination test.
  2. B.been asked for the blood group.
  3. C.been screened for HIV
  4. D.undergone malaria test.
Show the answer and explanation

Answer: A (undergone an agglutination test.)

Explanation

Before transfusion, the donor's and patient's blood should be mixed and checked for clumping (agglutination test, or cross-matching). This would have shown the blood was incompatible.