The TDX fluorescence polarization assays (FPIA) for procainamide (PA) and n-acetylprocainamide (NAPA) were evaluated. Coefficients of variation for within- and between-assay precision studies were less than 6%. Both methods correlated well with a referenced HPLC technique; r2 values for PA and NAPA were 0.980 and 0.986, respectively.
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