a guy got into a car accident and recieved 5 units of blood

a guy got into a car accident and recieved 5 units of blood. His blood type was determined to be O, D-negative. a few weeks late, he was readmitted and the antibodies indetified were anti-D and anti-C.   

What are the explination for the antibodie idtentified?

why is it unneccessary to perform D control with weak D test?

Solution

C-antigen is found to be clinically most important RH antigen. today there are 49 rh antigens found. Diff antigen is reported to cause hemolytic disease .RH antibodies are produced when and RH negative individual is transfused with RH positive blood. Here in this case that guy may be transfused with blood in which the d antigen is being weakly expressed.

Weak D testing is performed to find out whether the RH negative donors are truly rh negative or not.