Definition of complement fixation in English English dictionary
The binding of active serum complement to an antigen-antibody pair. It is the basis for various diagnostic tests to detect the presence of a specific antigen or antibody
an immune response in which an antigen-antibody combination inactivates a complement (so it is unavailable to participate in a second antigen-antibody combination)
a blood test in which a sample of serum is exposed to a particular antigen and complement in order to determine whether or not antibodies to that particular antigen are present; used as a diagnostic test