Leflunomide as Metabolite (Therapeutic Drug Monitoring), Blood Test (2531B)

Leflunomide as Metabolite (Therapeutic Drug Monitoring), Blood Test (2531B)

Analysis Code 2531B 
Test Name Leflunomide as Metabolite (Therapeutic Drug Monitoring), Blood 
Test Includes Teriflunomide 
Compound Synonym(s) Arava®; Leflunomide Metabolite 
Purpose This test is designed for the therapeutic drug monitoring of teriflunomide (leflunomide active metabolite) levels to ensure adequate dosage. The minimum reporting limit of this assay is 500 ng/mL. THIS TEST IS NOT MEANT TO MONITOR THE ELIMINATION OF TERIFLUNOMIDE IN WOMEN OF CHILDBEARING POTENTIAL WHO DISCONTINUE LEFLUNOMIDE. This test is New York State approved. 
Category Immunomodulator 
Method(s) High Performance Liquid Chromatography/
TandemMass Spectrometry (LC-MS/MS) 
Specimen Requirements 1 mL Blood 
Transport Temperature Refrigerated 
Specimen Container Lavender top tube (EDTA) 
Special Handling None 
Light Protection Required Not Required 
Stability Room Temperature: 30 day(s)
Refrigerated: 30 day(s)
Frozen (-20 °C): 30 day(s) 
*Rejection Criteria None 
Day(s) Test Set-up / TAT [LC-MS/MS] Tuesday / 3 days 
Suggested CPT Code 80375 
**Minimum Volume 0.2025 mL 
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You are viewing Leflunomide as Metabolite (Therapeutic Drug Monitoring), Blood Test (2531B)
*Rejection criteria pertain to clinical specimen submissions only.
**Stated minimum volume allows for a single analysis. Repeat analysis will not be performed.


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