reverse passive agglutination

https://doi.org/10.1351/goldbook.09683
Modification of the indirect agglutination assay, where the particles are coated with antibody.
Note: These antibody-laden particles become probes for detecting specific antigens in the sample material. The presence of the relevant antigen will result in the agglutination of particles.
Source:
PAC, 2018, 90, 1121. (Terminology of bioanalytical methods (IUPAC Recommendations 2018)) on page 1142 [Terms] [Paper]