Abstract
Quantitation of red cell agglutination can be made by counting the residual free cells remaining after agglutination and comparing the count with the pre‐agglutination red cell count. Most previous studies have used visual hemocytometry for this purpose. The use of the Coulter Model B electronic particle counter has been investigated and is shown to be a practical alternative.The problem of counting a free cell population overlapped in size by small aggregates is approached by two methods. In the first, a correction is made for aggregates present in the size range of single red cells based on the change in mean particle volume which results from the presence of cell clumps. In the second, red cells are counted in a size range in which aggregates are unlikely to occur. The methods are evaluated and their extension to provide further data on the pattern of red cell aggregation in agglutination is indicated.
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