Abstract

Fujimoto et al. (1) reported that the stability of galactose 1-phosphate in dried blood spots for neonatal screening was adversely affected by humidity and temperature, especially when low-value samples are evaluated. We extend these findings to glucose-6-phosphate dehydrogenase (G-6-PD; EC 1.1.1.49) activity, deficiency of which is by far the most common genetic disease worldwide (2) and accounts for more than one-half of the cases of severe jaundice among male newborns in Greece, China, and in Sephardic Jewish groups (3). Tests for G-6-PD deficiency are thus included in newborn screening programs in some regions. We collected whole-blood specimens from …

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