Determination of Levetiracetam in Human Plasma by Dispersive Liquid-Liquid Microextraction Followed by Gas Chromatography-Mass Spectrometry

Table 5

Within- and between-days accuracy and precision.

Analyte	Nominal concentration (µg mL^−1)	Measured concentration (µg mL^−1)	Precision RSD (%)	Accuracy RE (%)
Within-day
LEV	2.0	1.9	10.6	−3.1
	4.0	4.1	11.4	3.1
	40.0	38.0	7.6	−5.0
	60.0	57.8	8.9	−3.6
Between-day
LEV	2.0	2.0	4.6	1.6
	4.0	4.2	−8.1	5.1
	40.0	39.1	3.0	−2.4
	60.0	61.6	4.0	2.6

RSD, relative error deviation expressed as percentage (%).
RE, relative error expressed as percentage (%).