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HelpTest Code Billings Clinic: 8018 Mayo: FWARP Warfarin, Plasma
Reporting Name
Warfarin, PlasmaPerforming Laboratory
NMS LabsMethod Name
High Performance Liquid Chromatography/Tandem Mass Spectrometry (LC/MS/MS)
Specimen Required
**Must submit one specimen per order. Specimens cannot be shared between multiple orders.***
Collection Container/Tube: EDTA (lavender top) or pink top
Submission Container/Tube: Plastic vial
Specimen Volume: 1 mL
Collection Instructions:
1. Draw blood in EDTA (lavender top) or pink top tube(s). Plasma gel tube is not acceptable.
2. Centrifuge and send 1 mL of plasma refrigerate in preservative-free plastic vial.
Specimen Type
Plasma EDTASpecimen Minimum Volume
0.5 mL
Specimen Stability Information
| Specimen Type | Temperature | Time | Special Container |
|---|---|---|---|
| Plasma EDTA | Refrigerated (preferred) | 30 days | |
| Ambient | 30 days | ||
| Frozen | |||
Reject Due To
| Other | Polymer gel separation tube (SST or PST) |
Reference Values
Reporting limit determined each analysis.
None Detected mcg/mL
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.
Day(s) Performed
Monday-Sunday
Report Available
9 to 11 daysTest 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.CPT 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 |