| Test Name: |
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Factor X Chromogenic Activity, Vitamin K Antagonist Therapy
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| Test Code(s): |
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MISC / RMISC
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| CPT Code(s): |
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85260
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| Testing Site: |
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Testing will be sent to an approved reference laboratory.
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| Turnaround Time: |
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Routine: 3 - 7 days.
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Specimen Requirements
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| Specimen: |
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Blood
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| Collection Instructions: |
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Please indicate if patient is receiving anticoagulant (Warfarin/Heparin/Vitamin K antagonist), direct thrombin inhibitor or fibrinolytic agent therapy.
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| Collection Container: |
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Also Acceptable:
Light blue top (3.2% NaCitrate)
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| Collection Volume: |
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Preferred: 4 mL
Pediatrics: 1.5 mL
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| Sample Analyzed: |
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Plasma
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| Volume Required: |
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Preferred: 1 mL
Pediatrics: 0.5 mL
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| Specimen Processing: |
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Centrifuge specimen to yield platelet poor plasma/serum (platelet count should be less than 10 K/µL). Separate plasma/serum and transfer to plastic tube or vial. Freeze plasma/serum at -20°C or below.
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| Specimen Transport: |
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Transport whole blood specimen at room temperature to UWHC Core Laboratory (B4/220) within 4 hours of collection. See Specimen Processing for instructions if transport criteria are not met.
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| Outreach Specimen Transport: |
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Transport frozen aliquot on dry ice to UWHC Core Laboratory (B4/220).
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| Unacceptable Criteria: |
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Hemolyzed specimens, clotted specimens, partially filled tubes and whole blood specimens greater than 4 hours old when received by the laboratory are not acceptable.
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Interpretation
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