TABLE 1.

Intra- and interday accuracy and precision

Drug	Nominal valuea (μg/ml)	Accuracy (% deviation)	Precision (% RSD)
			Intraday	Interday
ITC	0.10	6.23	9.12	6.34
	1.50	2.30	4.30	8.70
	3.00	0.14	5.72	12.01
	5.00	4.60	7.86	12.64
PSC	0.10	8.08	4.89	8.70
	1.50	1.30	3.70	7.10
	3.00	3.83	4.20	6.61
	5.00	4.99	5.77	6.96
VRC	0.12	1.50	5.81	13.30
	1.50	1.70	3.60	9.10
	4.00	5.78	4.09	8.09
	6.00	9.55	5.90	6.09

^aPlasmatic concentrations of quality controls.