Table 1.

Inter- and intraassay errors of the applied analytical method.

	Nominal concentration (ng/mL)	Mean ± SD (ng/mL)	% RSD	% RE	n
Interassay	50	50.1 ± 1.4	2.7	0.11	15
	100	103 ± 2.4	2.3	2.8	15
	1000	1045 ± 25	2.4	4.5	15
	10,000	10,157 ± 260	2.6	1.6	15
Intraassay	50	50.7 ± 1.1	2.2	1.5	5
	100	104 ± 2.0	1.9	3.7	5
	1000	1035 ± 17	1.6	3.5	5
	10,000	10,115 ± 264	2.6	1.2	5

Note: % RSD, relative standard deviation; %RE, relative error from nominal concentration.

Abbreviation: SD, standard deviation.