Discussion
Positive result of the complement fixation reaction is expressed in
Answer: A
Correct answer: complete inhibition of haemolysis
A positive result means the antigen and antibody did correspond, so the complement was fixed by their complex. None is left for the indicator system, the red cells stay intact, and they settle as a button - no haemolysis. It is an inversion that catches people out: no lysis means the test is positive.
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