8 - 10 days
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High-Pressure Liquid Chromatography/ Tandem Mass Spec (HPLC/MS/MS)
Monitoring patients whose prothrombin time is inconsistent with the prescribed Warfarin dose.
Therapeutic: 2.0 mcg/mL
* Reference ranges may change over time. Please refer to the original patient report when evaluating results.
Collect specimen in a EDTA lav top tube. Centrifuge, aliquot plasma into a plastic vial and refrigerate (preferred) or freeze.