Table 1: Interday average backcalculated standard concentrations (n = 3).

Nominal concentration (ng/mL)501002505001000250050001000025000R
Mean (ng/mL)50.191.62365211043266349739977248000.9992
Precision (RSD, %)3.826.113.312.983.372.508.063.722.910.0379
Accuracy (% dev.)0.13−8.37−5.604.134.336.53−0.53−0.23−0.80
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