Conc.

(ng/band)

Recovery (%) ± SD^a

Intra-day precision

Inter-day precision

Mean ± SD^a

% RSD

Mean ± SD^a

% RSD

3

101.54 ± 3.13

98.17 ± 2.56

2.61

98.35 ± 2.20

2.24

30

101.86 ± 0.70

99.79 ± 2.66

2.66

98.25 ± 1.87

1.90

180

99.11 ± 0.44

99.17 ± 0.67

0.67

98.80 ± 1.47

1.48