Question

A sample of blood shows clumping with antiserum "A", but not with antiserum "B" and antiserum "D". The blood group will be

• A. AB (+ve)
• B. A (-ve)
• C. B (+ve)
• D. A (+ve)

Answer 1

Answer: (B)

A (-ve)

A) The blood clots with antiserum A but not with antiserum B and D so it cannot be AB (+ve). Antiserum D represents the Rh factor.

B) The blood clots with only antiserum A and does not clot with antiserums B and D so it is A (-ve) blood.

C) The blood did not clot with antiserum B or D so it is not B (+ve) blood.

D) The blood clotted with antiserum A, but it did not clot with antiserum D so it cannot be A (+ve).

So the correct answer is 'A (-ve)'.