Concentration added (ng/ml)

Concentration found (mean ± SD) (ng/ml )

%CV

%Bias

0.98

0.97 ± 0.034

1.98

-1.40

       2.94

2.85 ± 0.133

1.99

-2.31

400

390 ± 0.520

1.41

-1.90

800

802.24 ± 1.675

1.67

-3.05