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HelpTest Code FWARP Warfarin, Plasma
Specimen Required
**Must submit one specimen per order. Specimens cannot be shared between multiple orders.***
Collection Container/Tube: Lavender top or pink top (EDTA) (Plasma gel tubes are not acceptable)
Submission Container/Tube: Plastic vial
Specimen volume: 1 mL Plasma
Collection instructions:
1. Promptly centrifuge and aliquot 1 mL of plasma into a preservative-free plastic vial.
2. Send refrigerated.
Specimen Stability Information: Refrigerated (preferred) 30 days/Ambient 30 days/Frozen 15 months
Secondary ID
75517Method Name
High Performance Liquid Chromatography/Tandem Mass Spectrometry (LC/MS/MS)
Reporting Name
Warfarin, PlasmaSpecimen Type
Plasma EDTASpecimen Minimum Volume
Plasma: 0.5 mL
Specimen Stability Information
| Specimen Type | Temperature | Time |
|---|---|---|
| Plasma EDTA | Refrigerated (preferred) | 30 days |
| Ambient | 30 days | |
| Frozen | ||
Reject Due To
All specimens will be evaluated by the processing and performing laboratories for test suitability.Reference Values
Reporting limit determined each analysis.
None detected
Day(s) Performed
Monday through Sunday
Report Available
9 to 11 daysSpecimen Retention Time
2 weeksPerforming Laboratory
NMS LabsCPT Code Information
80375
LOINC Code Information
| Test ID | Test Order Name | Order LOINC Value |
|---|---|---|
| FWARP | Warfarin, Plasma | 4098-0 |
| Result ID | Test Result Name | Result LOINC Value |
|---|---|---|
| Z5526 | Warfarin | 4098-0 |
Test Classification
This test was developed and its performance characteristics determined by NMS Labs. It has not been cleared or approved by the U.S. Food and Drug Administration.Interpretation
The dosage of warfarin is best adjusted based on the International Normalized Ratio (INR) for prothrombin time. Peak plasma concentrations following single 10 mL doses averaged 0.6 mcg/mL for both R-warfarin and S-warfarin (combined concentration 1.2 mcg/mL). This test is not chiral specific and does not distinguish between the R and S enantiomers of warfarin. The blood to plasma ratio is approximately 0.5.
Clinical Information
Refer to www.nmslabs.com/test-catalog.