Measurement of the Flocculation of Suspensions

AT the Third International Rheological Congress held in Germany in September 1958, Prof. R. Fahraeus, in a paper entitled “The Influence of the Rouleau Formation of the Erythrocytes on the Rheology of the Blood”, described a method which he had developed for measuring the degree of coagulation present in a blood sample. The procedure was to filter the blood through a stack of filter papers and to measure the quantity retained on each. The greater the coagulation of the blood, the less the number of papers through which it could penetrate.