Warfarin 
Mnemonic WARFARIN
CPT 80375
Test Code 3508110
Synonyms Coumadin®, Sodium Warfarin, Jantoven®
Test Includes  
Specimen Serum
Volume 2.0 mL
Container Red Top Tube. Do NOT use SSTs.
Special Instructions  
Specimen Prep Centrifuge* For Red Top only, transfer serum to a Plastic Transport Tube.
Storage Refrigerate
Transport Temp Room Temperature
Stability Rm Temp 14 days
Stability Refrig 14 days
Stability Frozen 14 days
Methodology Liquid chromatography/tandem mass spectrometry (LC/MS-MS)
Rejection Criteria   
Reference Value 1.0- 10.0 µg/mL; Potentially toxic: >10.0 µg/mL  
Performed/TAT Two times per week   Reported in 3-5 days    
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