Final answer:
Hemolysis is observed in a few serologic assays, including the direct Coombs' test, the viral hemagglutination inhibition assay (HIA), and the complement fixation test.
Step-by-step explanation:
Hemolysis is a visible endpoint result in a few serologic assays.
One example is the direct Coombs' test, which uses hemagglutination to detect the presence of nonagglutinating antibodies and complement bound to red blood cells.
Another example is the viral hemagglutination inhibition assay (HIA), which measures the titer of antiviral antibodies by observing hemagglutination of red blood cells when a standardized amount of virus is added to patient serum.
The complement fixation test uses hemolysis of red blood cells to detect antibodies against pathogens that are difficult to culture in the lab.