Leflunomide Metabolite, Serum or Plasma

Sunquest Code:LEFMET  
Epic Code:LAB6671Epic Name:Leflunomide Metabolite
Methodology:High performance liquid chromatography/Mass spectrometry
Turnaround Time:Specimens are sent to reference laboratory Mon-Sat; results are reported within 1-6 days.

This test was developed and its performance characteristics determined by ARUP Laboratories. The U.S. Food and Drug Administration has not approved or cleared this test; however, FDA clearance or approval is not currently required for clinical use. The results are not intended to be used as the sole means for clinical diagnosis or patient management decisions.

Collection Instructions

Optimal Volume:2 mL
Minimum\Peds Volume:0.6 mL
Container:Red (no gel) (Green (sodium heparin, no gel), Purple (EDTA))
Patient Preparation:Timing of specimen collection: Predose (trough). Obtain specimen 12-24 hours after last dose.
Causes for Rejection:Collection in a serum separator tube; whole blood.

Processing and Shipping

Specimen Processing:Centrifuge and aliquot 1 mL, 0.2 mL minimum within 2 hours of collection. Store in refrigerator.
Shipping Instructions:Ship at refrigerated temperature. Room temperature or frozen is also acceptable.
Stability:Stability: 7 days at room temperature; 17 days refrigerated; 90 days frozen.
Test Performed at or Referral Lab Lab Sendouts  (ARUP)
Referral Lab number:2007460


Reference Range:Therapeutic and toxic ranges are not well established. Concentrations greater than 40.000 ug/mL tend to correlate with improved patient outcome. A proposed therapeutic range is 50.000-100.000 ug/mL.

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