A photometric method and apparatus for measuring agglutination in a biological agglutination reaction system test sample using a laser beam source and at least one photodetector for detecting light scattered by the test sample. The method includes the following steps: (1) arranging the at least one photodetector...http://www.google.com.au/patents/US4766083?utm_source=gb-gplus-sharePatent US4766083 - Method for the photometric determination of biological agglutination
