A serological test that uses red blood cells coated with exogenous antigens such as bacterial polysaccharides as a method to detect patient antibodies against those exogenous antigens is called:

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The serological test described in the question utilizes red blood cells (hemagglutination) coated with bacterial polysaccharides (exogenous antigens) to detect patient antibodies against those antigens. This is different from latex agglutination, which uses latex particles coated with antibodies to detect the presence of specific antigens. Neutralization and complement fixation are also serological tests, but they do not involve red blood cells or exogenous antigens.

A Serological Test That Uses Red Blood Cells Coated with Exogenous