Table 2.

Accuracy and precision of the method of analysis.

Nominal Concentration (ng/ml)	Obtained concentration (mean±SD)	Accuracy (%)	Precision (%)
Intra-assay (n=5)
40	45.00±3.46	−12.50	7.68
160	159.33±0.75	0.42	0.47
400	427.67±2.17	−6.92	0.51
Inter-assay (n=3)
40	46.33±1.15	−15.83	2.49
160	161.55±3.03	−0.97	1.87
400	426.11±2.14	−6.53	0.50