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Test Code FWARP Warfarin, Plasma

Specimen Required

Container/Tube: EDTA (lavender top) or Pink top

Specimen Volume: 3 mL

Draw blood in EDTA (lavender top) or Pink top tube(s) (Plasma gel tube is not acceptable.) Spin down and send 1 mL of plasma refrigerate in preservative-free plastic vial.

Secondary ID


Method Name

High Performance Liquid Chromatography/Tandem Mass Spectrometry (LC/MS/MS)

Reporting Name

Warfarin, Plasma

Specimen Type

Plasma EDTA

Specimen Minimum Volume

0.5 mL

Specimen Stability Information

Specimen Type Temperature Time Special Container
Plasma EDTA Refrigerated (preferred) 14 days
  Frozen  90 days
  Ambient  14 days

Reject Due To

Hemolysis NA
Lipemia NA
Icterus NA
Other Polymer gel separation tube (SST or PST)

Reference Values

0.2 mcg/mL

The reported value may vary based on dilution or weight of the specimen.

Day(s) and Time(s) Performed


Performing Laboratory

NMS Labs

CPT Code Information


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