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MEXNE / MEX-M
MEXILETINE, S

Test Code MEXNE / MEX-M 
Test MEXILETINE, S 
Methodology High-Pressure Liquid Chromatography (HPLC) 
Description Useful for assessing achievement of optimal therapeutic concentrations and for assessing potential toxicity 
Specimen SERUM
Draw blood in plain, red-top tube(s) after patient has been receiving mexiletine for at least 3 days and just before administration of the next dose. (SERUM GEL TUBE IS NOT ACCEPTABLE.) Spin down and send 3.0 mL (minimum: 1.1 mL) of serum refrigerated. 
Reference Values Theraputic concentration: 0.8 - 2.0 g/mL (trough value)
Toxic concentration: > 2.0 g/mL (trough value) 
Analytic Time 1 Day 
Day(s) Test Set Up Once a week 
CPT Code(s) 80299