Mean 6 SD G6PD activity for normal samples using the digital microfluidic method and
the standard method, respectively, was 9.7 6 2.8 and 11.1 6 3.0 U/g hemoglobin (Hb),
respectively; for G6PD-deficient samples, it was 0.8 6 0.7 and 1.4 6 0.9 U/g Hb. Bland-Altman
analysis determined a mean difference of –0.96 6 1.8 U/g Hb between the digital microfluidic
fluorescence results and the standard biochemical test results. The lower and upper limits for
the digital microfluidic platform were 4.5 to 19.5 U/g Hb for normal samples and 0.2 to 3.7 U/g
Hb for G6PD-deficient samples. The lower and upper limits for the Stanford method were 5.5 to
20.7 U/g Hb for normal samples and 0.1 to 2.8 U/g Hb for G6PD-deficient samples.