Cryopreservation of glucose-6-phosphate dehydrogenase activity inside red blood cells: developing a specimen repository in support of development and evaluation of glucose-6-phosphate dehydrogenase deficiency tests

Table 1 Characteristics of the 31 specimens used to evaluate G6PD activity within cryopreserved red blood cells [[16]]

Phenotype by activity	Male	Female	Total	Phenotype by cytochemical staining	Male	Female	Total
Normal	6	4	10	Normal	6	3	9
Intermediate	0	3	3	Heterozygous	-	4	4
Deficient	15	3	18	Deficient	15	3	18
Total	21	10	31	Total	21	10	31

G6PD activity was determined by spectrophotometry with a quantitative assay. G6PD activity within red blood cells was observed by flow cytometry.

ISSN: 1475-2875