passive hemagglutination

n.
  1. Passive agglutination in which red blood cells are used to adsorb soluble antigen onto their surfaces; the red blood cells then agglutinate in the presence of antiserum specific for the adsorbed antigen.indirect hemagglutination test
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.