Test Overview
Test Methodology

High Turbulence Liquid Chromatography–Tandem Mass Spectrometry (HTLC-MS/MS)

Test Usage

Therapeutic Drug Monitoring

Reference Range *

Therapeutic: >40 mcg/mL; Elimination: <0.020 mcg/mL

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

Test Details
Days Set Up
Monday, Wednesday, Friday
Analytic Time

3 - 7 days

Soft Order Code
FLEFL
MiChart Code
Leflunomide Metabolite Serum (Sendout)
Synonyms
  • Arava
  • Teriflunomide
  • FLEFL
Laboratory
Sendout
Reference Laboratory
Mayo LEFLU (60292)
Section
Special Testing
Specimen Requirements
Collection Instructions

Collect specimen in a red top (preferred) or SST tube. Centrifuge and aliquot serum into a plastic vial within 2 hours of collection. Store and transport at room temperature (preferred); specimen may be stored refrigerated or frozen for up to 14 days.

Normal Volume
1 mL serum
Minimum Volume
0.3 mL serum
Additional Information

Test sent to Mayo Medical Laboratories.

Billing
CPT Code
80193
Fee Code
AA905