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

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
20419
NY State Approved
No