AN INDIRECT METHOD FOR MAKING RED CELL COUNTS

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Abstract
Since the number of red cells per cu. mm. of blood is given by dividing the figure for % volume, X107, by the mean volume of the individual cell in [mu]3, and since the % volume can be found by a high speed hematocrit and the individual cell volume by diffractometric measurement of the radius of the spheres which result when "lecithin ab ovo" is emulsified in the plasma surrounding them, the number of cells per cu. mm. of blood can be found without counting the cells at all. The method, which is very rapid, is fully described, and it is shown that the results agree with those given by ordinary red cell counting methods.

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