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HelpTest Code LAB5529 Leflunomide Metabolite (Teriflunomide), Serum
Performing Laboratory
Mayo Clinic Laboratories in Rochester
Reporting Name
Leflunomide Metabolite, SSpecimen Type
Serum RedSpecimen Required
Supplies: Sarstedt Aliquot Tube, 5 mL (T914)
Collection Container/Tube:
Preferred: Red top
Acceptable: Serum gel
Submission Container/Tube: Plastic vial
Specimen Volume: 1 mL serum
Collection Instructions:
1. Draw blood no sooner than 12 hours (trough value) after last dose.
2. Within 2 hours of collection, centrifuge and aliquot serum into a plastic vial.
Reject Due To
| Gross hemolysis | OK |
| Gross lipemia | OK |
| Gross icterus | OK |
Specimen Stability Information
| Specimen Type | Temperature | Time |
|---|---|---|
| Serum Red | Ambient (preferred) | 28 days |
| Frozen | 28 days | |
| Refrigerated | 28 days |
Specimen Minimum Volume
Serum: 0.3 mL
Day(s) Performed
Monday, Wednesday, Friday
Specimen Retention Time
14 daysReport Available
3 to 5 daysReference Values
Therapeutic: >40 mcg/mL
Elimination: <0.020 mcg/mL
Useful For
Therapeutic monitoring of patients actively taking leflunomide
Assessment of elimination in patients requiring enhanced elimination of the drug
CPT Code Information
80193
LOINC Code Information
| Test ID | Test Order Name | Order LOINC Value |
|---|---|---|
| LEFLU | Leflunomide Metabolite, S | 44828-2 |
| Result ID | Test Result Name | Result LOINC Value |
|---|---|---|
| 60292 | Leflunomide Metabolite, S | 44828-2 |
Forms
If not ordering electronically, complete, print, and send 1 of the following forms with the specimen:
-Therapeutics Test Request (T831)