Yale New Haven Hospital

Department of Laboratory Medicine
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Warfarin

Lab Section: 

Sendout Reference

 

Lab Location: 

Sendout

Reference Lab: 

Mayo

 

Test ID: 

LAB3651

 

Synonyms: 

Coumadin

Methodology: 

High-Performance Liquid Chromatography (HPLC)

Schedule: 

Daily

Reported: 

7 days

Specimen Requirements: 

Collection: 3 mL Blood in a Red Top Tube.
Pediatric volume: 2 mL.
Serum; Plain, red-top tube(s)
Unacceptable conditions: Serum gel tube; lipemic specimens
Stability: Refrigerated (preferred): 21 days; Ambient: 28 days; Frozen: 28 days

 

Notes: 

Clinical Indications: Monitoring patients whose prothrombin time is inconsistent with the prescribed warfarin dose, particularly when failure to comply or surreptitious drug use is suspected. Note: This test is not useful for evaluation of the patient with prolonged bleeding time suspected of exposure to rat poisons.

Reference Interval: 

See patient report or consult reference laboratory website.

http://www.mayomedicallaboratories.com/test-catalog/Specimen/8760

CPT Code(s): 

80299

Last Changed: 

8/17/2017 7:21:15

Last Reviewed: 

8/17/2017 7:21:27