Test Overview
Test Methodology
Liquid Chromatography/Tandem Mass Spectrometry (LC-MS/MS)
Test Usage
Therapeutic drug monitoring.
Reference Range *
< 235 ng/mL
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.
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