G6PD and hyperinsulinemic hypoglycemia, familial, 4: Whilst the biochemical genetics of G6PD deficiency are well understood, data are scarce on the haemolytic effects of daily primaquine doses in G6PD heterozygous females with intermediate levels of G6PD activity (~ 30–80%), who would have a “normal” result using current G6PD deficiency rapid tests.