Test Overview
Test Methodology

Liquid Chromatography-Tandem Mass Spectrometry (LC-MS/MS)

Test Usage

Monitor therapeutic drug level

Reference Range *

Therapeutic: 0.5 - 2.0 mcg/mL; Toxic: greater than 2 mcg/mL.

* Reference ranges may change over time. Please refer to the original patient report when evaluating results.

Test Details
Days Set Up
Monday - Saturday
Analytic Time

2 - 6 days

Soft Order Code
MEX
Synonyms
    Laboratory
    Sendout
    Reference Laboratory
    Mayo MEX (9245)
    Section
    Special Testing
    Specimen Requirements
    Collection Instructions

    Collect a trough specimen in a red top tube after patient has been receiving Mexiletine for at least 3 days; do not use SST tube. Centrifuge within 2 hours of collection, aliquot serum into a plastic vial and refrigerate.

    Normal Volume
    1.5 mL serum
    Minimum Volume
    0.5 mL serum
    Rejection Criteria
    SST tube not acceptable.
    Additional Information

    Test sent to Mayo Clinic Laboratories.

    Billing
    CPT Code
    80299
    Fee Code
    20039
    LOINC
    3819-0
    NY State Approved
    No