Reliability of quantitative and qualitative tests to identify heterozygotes carrying severe or mild G6PD deficiency.

To determine if the qualitative test (cytochemical) is more reliable than the quantitative test (differential pH-metry) in identifying heterozygous G6PD- subjects.,Identification of heterozygous G6PD- subjects was done by the measurement of G6PD activity and by a cytochemical test.,A cytochemical test is more sensitive than differential pH-metry to identify heterozygous G6PD- subjects.,A cytochemical test is a reliable method for mass screening for G6PD deficiency to identify G6PD- heterozygotes.