A blood bank holds 4 units each of groups A, B, AB and O…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
A blood bank holds units each of groups A, B, AB and O. A patient needs blood, and any unit that is safe by the ABO groups may be used.
- How many units are safe for a patient of group B?
- How many units are safe for a patient of group AB?
- How many units are safe for a patient of group O?
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.
Given. units of each group.
Plan. List the groups that can give, then multiply their number by .
Step 1. Group B. Safe donors: B and O, which is groups. units.
Step 2. Group AB. All four groups can give. units.
Step 3. Group O. Only O can give. units.
Answer: ; ; units.
Check. AB is the universal recipient, so it has the most units. O receives only from O, so it has the fewest.
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