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Table 1 GAA enzyme activity intra- and interday assays using DBS from low to high quality controls (QCs)

From: Diagnosis of late-onset Pompe disease and other muscle disorders by next-generation sequencing

  Intraday assays (n = 5)
  QC1 QC2 QC3 QC4
Mean (μmol/h/L) 0.28 0.84 6.79 13.67
Range (μmol/h/L) 0.20–0.49 0.75–0.89 6.20–7.64 11.50–15.83
RSD% 41.42 6.44 8.70 12.79
  Interday assays (n = 5)
  QC1 QC2 QC3 QC4
Mean (μmol/h/L) 0.33 1.00 7.29 13.70
Range (μmol/h/L) (0.17–0.53) (0.69–1.44) (6.85–7.69) (12.08–15.09)
RSD% 38.75 27.17 4.22 9.37
  1. RSD relative standard deviation