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5 mL blood in EDTA tube.
Documentation of accidental or intentional overdose (including some rat poisons).
This test is not used for monitoring oral anticoagulant therapy; see International normalised ratio.
Occasionally helpful to document lack of compliance with warfarin therapy.
The presence of warfarin indicates ingestion has occurred.
Kelly JC and O’Malley K. Clin Pharmacokinet 1979; 4: 1-15.