Test Overview
Test Methodology
High-Pressure Liquid Chromatography/ Tandem Mass Spec (HPLC/MS/MS)
Test Usage
Monitoring patients whose prothrombin time is inconsistent with the prescribed Warfarin dose.
Reference Range *
Therapeutic: 2.0 mcg/mL
* Reference ranges may change over time. Please refer to the original patient report when evaluating results.
Test Details
Days Set Up
Monday - Sunday
Analytic Time
8 - 10 days
Soft Order Code
FWARP
MiChart Code
Warfarin, Plasma
Synonyms
- Coumadin
- Panwarfarin
- WRF
- WARFARIN (COUMADIN) PLASMA
Laboratory
Sendout
Reference Laboratory
Mayo FWARP
Section
Special Testing
Specimen Requirements
Collection Instructions
Collect specimen in a EDTA lav top tube. Centrifuge, aliquot plasma into a plastic vial and refrigerate (preferred) or freeze.
Normal Volume
3 mL plasma
Minimum Volume
1.1 mL plasma
Additional Information
Test sent to Mayo Medical Laboratories; performed by NMS labs
Billing
CPT Code
80375
Fee Code
AA879