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Table 1 Intra-assay, inter-assay accuracy, and imprecision for VMA in human urine

From: A new approach for urinary vanillylmandelic acid determination using eVol microextraction by packed sorbent coupled to liquid chromatography-tandem mass spectrometry

Analytes Concentration (μg/mL) Intra-assay Inter-assay Total (%CV)
Mean ± SD (μg/mL) Accuracy (%) CV (%) Mean ± SD (μg/mL) Accuracy (%) CV (%)
VMA 0.500 0.550 ± 0.040 110.0 7.3 0.532 ± 0.033 106.4 6.3 9.6
3.50 3.60 ± 0.18 102.9 4.9 3.40 ± 0.22 97.1 6.4 8.1
10.0 11.1 ± 0.5 111.0 3.3 10.7 ± 0.6 107.0 3.9 5.1
80.0 83.6 ± 4.0 104.5 4.6 80.6 ± 4.8 100.8 5.7 7.3