GSTM1 and anemia (phenotype): In summary, our results suggest that analyses of capillary blood samples from toddlers and pregnant women with HemoCue indicate higher Hb concentrations than analyses of venous blood samples with Coulter Counter; as a result, estimates of the prevalence of anemia among toddlers and pregnant women are likely to be lower if based on analyses of capillary samples than if based on analyses of venous samples.