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Laboratory Test Directory

Mexiletine, Serum or Plasma


Name Method Department Units
Mexiletine Quantitative Liquid Chromatography-Tandem Mass Spectrometry
Send Out ug/mL

Specimen Requirements

Plasma Spun, Serum Spun

Container Type Container Size Specimen Volume

Red tube, (no anticoagulant), No Gel

3 mL 1 mL

Purple tube (EDTA)

3 mL 1 mL

Refrigerated - 5 day(s)
Frozen - 2 month(s)
Room temperature - 2 day(s)

Specimen Preparation

  • Centrifuge within 2 hours, separate supernatant and refrigerate

Reasons for Rejection

  • Collected in tube with gel separator
  • Not centrifuged within time frame
  • Wrong collection tube


Timing of specimen collection: Pre-dose (trough) draw - At steady state concentration.

CPT Code

  • 80299