Think only of the ABO groups. A woman of group A needs blood…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
Think only of the ABO groups.
- A woman of group A needs blood. Which groups can give it safely?
- Which group can receive from every ABO group?
- A man of group O needs blood. Which group can give it safely?
- Which antibody is found in the plasma of a person of group A?
Need a reminder? The key ideaShow
A transfusion is safe when no antigen of the donor meets its antibody in the recipient. Group A has antigen A and anti-B. Group B has antigen B and anti-A. Group AB has both antigens and no antibodies. Group O has no antigen and both antibodies. An Rh negative mother with an Rh positive foetus makes anti-Rh antibodies after the first delivery.
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. (a) Group A has anti-B. A donor must not carry antigen B. The donors are A and O.
Step 2. (b) AB, which has no antibodies.
Step 3. (c) Group O has anti-A and anti-B. A donor must carry neither antigen. Only O can give.
Step 4. (d) Anti-B.
Answer: (a) A and O; (b) AB; (c) O; (d) anti-B.
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