4 - 8 days
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Liquid Chromatography/Tandem Mass Spectrometry (LC/MS/MS)
Therapeutic drug monitoring.
Encainide: 15 - 100 ng/mL; O-desmethylencainide (ODE): 100 - 300 ng/mL; 3-methoxy-ode (MODE): 60 - 300 ng/mL. Ten percent of patients do not form therapeutic levels of the active metabolites MODE and ODE. In these patients, the recommended range for encainide is 300 - 1,200 ng/mL.
* Reference ranges may change over time. Please refer to the original patient report when evaluating results.