Accuracy of the method was determined by investigating control
solutions at three concentration levels of carvrdilol (50,120 and
180 ng mL1) which was defined by recovery (R %). Triplicate extractions
of the control solutions were performed at each concentration
level and on three consecutive days to determine the intraday
and inter-day precision, which was expressed in terms of
relative standard deviation (RSD, %) of the recovery. Ultimately,
applicability of this procedure was tested on real samples by
analyzing carvedilol in plasma of a volunteer patient