Quantification of Warfarin in Dried Rat Plasma Spots by High-Performance Liquid Chromatography with Tandem Mass Spectrometry

Table 2

Extraction recovery, process efficiency, and the matrix effect.

Nominal conc. (ng/mL)	Extraction recovery (%, mean)	Process efficiency (%, mean)	Matrix effect (%, mean)
50	96.9	105.4	108.8
800	99.5	101.4	101.9
4000	82.2	83.9	102.1

for each QC level.