Test Overview
Test Methodology

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

Test Usage

Therapeutic drug monitoring.

Reference Range *

< 235 ng/mL

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

Test Limitations

Peak concentrations and elimination half-life are affected by fat content in food, time of day and concomitant medications.

Test Details
Days Set Up
Daily
Analytic Time

4 - 8 days

Soft Order Code
MMLR
Synonyms
    Laboratory
    Sendout
    Reference Laboratory
    Mayo FGTIA (MedTox 409)
    Section
    Special Testing
    Specimen Requirements
    Collection Instructions

    Collect specimen in a red top tube; do not use SST tube. Centrifuge, aliquot serum into a plastic vial and refrigerate. For maximum clinical significance, usual sampling times are Peak: 1 hour after administration of oral dose or Trough: immediately before next dose is given. Indicate whether specimen is Peak, Trough, or Random level.

    Normal Volume
    3 mL serum
    Minimum Volume
    0.6 mL serum
    Rejection Criteria
    SST tube not acceptable.
    Additional Information

    Test sent to Mayo Medical Laboratories; performed by MedTox Laboratories.

    Billing
    CPT Code
    80199
    LOINC
    21565-7
    NY State Approved
    No