A<unk>  (or<unk>  agglutination test) is an agglutination technique used to detect antibodies, such as those produced in response to the rubella virus or the rheumatoid factor.
Latex fixation test
Fluorescent treponemal antibody absorbtion 
Direct fluorescent antibody
Heterophile antibody test
RAST test
Spectrophotometry
Counterimmunoelectrophoresis
Pathergy test