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Factor X Activity, Chromogenic
Test Code10663
CPT Codes
85260
Preferred Specimen
1 mL frozen plasma collected in 3.2% sodium citrate (light blue-top) tube
Minimum Volume
0.5 mL
Instructions
Platelet-poor plasma: Centrifuge light blue 15 minutes at approximately 1500X g within 60 minutes of collection. Using a plastic pipette, remove plasma, taking care to avoid the WBC/platelet buffy layer and place into a plastic vial. Centrifuge a second time and transfer platelet-poor plasma into a new plastic vial. Plasma must be free of platelets(<10,000/mcL). Freeze immediately and ship on dry ice.
Transport Temperature
Frozen
Specimen Stability
Room temperature: 2 hours
Refrigerted: 8 hours
Frozen: 21 days
Refrigerted: 8 hours
Frozen: 21 days
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Received room temperature • Received refrigerated • Gross Hemolysis • Icterus • Lipemia
Methodology
Chromogenic
Setup Schedule
Set up: Mon-Sat; Report available: 1-3 days
Reference Range
73-158 % activity
Therapeutic reference range: 11-42 % activity
Therapeutic reference range: 11-42 % activity
Clinical Significance
To assess Factor X chromogenic activity in plasma. This assay may help in monitoring OAC patients with prolonged pro-times such as Warfarin patients with lupus inhibitor.
