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Table 2 Intra- and interday precision and accuracy

From: Performance characteristics between TDx®FLx and TBA™-25FR for the therapeutic drug monitoring of methotrexate

Intraday variation
 Spiked MTX concentration (μmol/L) TDX/FLX TBA-25FR
Measured concentration (μmol/L) (mean ± S.D.) Accuracy (%) CV (%) Measured concentration (μmol/L) (mean ± S.D.) Accuracy (%) CV (%)
  0.07 0.077 ± 0.013 110 16.3 0.096 ± 0.011 137.1 11.2
  0.4 0.41 ± 0.025 102.5 6.2 0.41 ± 0.016 102.5 4.0
  0.8 0.85 ± 0.041 106.3 4.9 0.92 ± 0.040 115 4.4
Interday variation
 Spiked MTX concentration (μmol/L) TDX/FLX TBA-25FR
Measured concentration (μmol/L) (mean ± S.D.) Accuracy (%) CV (%) Measured concentration (μmol/L) (mean ± S.D.) Accuracy (%) CV (%)
  0.07 0.073 ± 0.010 104.3 14.5 0.96 ± 0.013 137.1 13.1
  0.4 0.41 ± 0.018 102.5 4.3 0.43 ± 0.020 107.5 4.6
  0.8 0.83 ± 0.045 103.8 5.4 0.93 ± 0.051 116.3 5.4