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
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.

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

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

Billing
CPT Code
80199
LOINC
21565-7
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