A new method is described for the graded estimation of G6PD activity in individual erythrocytes. The method appears to offer some technical advantages over other methods. It requires reagents that are neither hazardous nor unstable and such equipment as might be found in the usual hematology laboratory. It appears to be more sensitive than conventional methods for identification of women heterozygous for G6PD deficiency and further substantiates the existence of erythrocyte mosaicism in such individuals.

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