Mexiletine, Serum or Plasma

TEST: 716076
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CPT: 80299
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Synonyms

Mexitil®

Expected Turnaround Time

3 days

Turnaround time is defined as the usual number of days from the date of pickup of a specimen for testing to when the result is released to the ordering provider. In some cases, additional time should be allowed for additional confirmatory or additional reflex tests. Testing schedules may vary.

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Specimen Requirements

Specimen

Serum or plasma

Volume

1 mL

Minimum Volume

0.2 mL

Container

Red-top (no additive) tube or green-top (heparin) tube; gel-barrier tubes are not recommended

Collection

Transfer separated serum or plasma to a plastic transport tube. Trough levels are most reproducible.

Storage Instructions

Submission/transport (<3 days): Room temperature. For storage beyond three days, specimen should be refrigerated or frozen.

Stability Requirements

TemperaturePeriod
Room temperature7 days
Refrigerated14 days
Frozen14 days
Freeze/thaw cyclesStable x3

Test Details

Use

This test is used for therapeutic drug management.

Limitations

This test was developed and its performance characteristics determined by Labcorp. It has not been cleared or approved by the Food and Drug Administration.

Methodology

Liquid chromatography/tandem mass spectrometry (LC/MS-MS)

Reference Interval

500–2000 ng/mL

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The LOINC® codes are copyright © 1994-2021, Regenstrief Institute, Inc. and the Logical Observation Identifiers Names and Codes (LOINC) Committee. Permission is granted in perpetuity, without payment of license fees or royalties, to use, copy, or distribute the LOINC® codes for any commercial or non-commercial purpose, subject to the terms under the license agreement found at https://loinc.org/license/. Additional information regarding LOINC® codes can be found at LOINC.org, including the LOINC Manual, which can be downloaded at LOINC.org/downloads/files/LOINCManual.pdf