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Table 2 Results of accuracy, precision, and recovery for method validation using quality control (QC) samples

From: Detection of 6-monoacetylemorphine in hair sample of heroin addicts using gas chromatography–mass spectrometry and significance of rehabilitation program

Groups

QC ng/mg

Recovery (%)

Intra-day n=8

Inter-day n=16

Precisiona (CV%)

Accuracyb (bias%)

Precision (CV%)

Accuracy (bias%)

Addicts’ group

1.5

86.84

8.1

4.7

4.9

2.9

3

91.18

1.5

−1.2

4.6

−1.4

6

91.78

0.8

−5.1

3.9

−4.2

Rehab group

1.5

87.81

2.6

−8.7

6.9

1.1

3

93.62

1.1

−1.2

3.6

−1.9

6

90.84

0.6

−4.6

2.3

−4.8

  1. aExpressed as the relative standard deviation of the peak area ratios of the target compound/IS. bCalculated as [(calculated mean concentration − nominal concentration)/nominal concentration] × 100
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