Question

question 14

bill wants to determine his blood type, so he takes a few drops of blood from a puncture wound in his finger and mixes it with various antisera. his blood cells agglutinate when mixed with the anti-a sera but not with the anti-b or anti-d sera. this means

a) bill could receive type b blood in a transfusion.
b) bill could donate blood to an individual with type ab blood.
c) bill is rh positive.
d) bills plasma would cross-react with type o- red blood cells.

Explanation:

Determine Bill's blood type

Bill's red blood cells agglutinate with anti-A sera, but not with anti-B or anti-D (Rh) sera. This indicates the presence of the A antigen and the absence of B and Rh (D) antigens. Therefore, Bill's blood type is A negative (\(\text{A}^-\)).

Evaluate the options

• A: Type \(\text{A}^-\) individuals have anti-B antibodies in their plasma, so Bill cannot receive type B blood.
• B: Type \(\text{A}^-\) blood can be safely donated to individuals with type \(\text{AB}\) blood (both \(\text{AB}^+\) and \(\text{AB}^-\)) because \(\text{AB}\) recipients lack anti-A and anti-B antibodies.
• C: Bill is Rh negative because his cells did not agglutinate with anti-D sera.
• D: Type \(\text{O}^-\) red blood cells lack A, B, and Rh antigens, so Bill's plasma (containing anti-B antibodies) will not cross-react with them.

Answer:

• (A) Bill could receive type B blood in a transfusion.
• (B) Bill could donate blood to an individual with type AB blood. (Correct answer)
• (C) Bill is Rh positive.
• (D) Bill's plasma would cross-react with type O- red blood cells.