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Factor XI Activity and Human Inhibitor
Test Code17854X
Preferred Specimen
2 mL plasma (x2) collected in 3.2% sodium citrate (light blue-top) tubes
Minimum Volume
1 mL (x2)
Transport Temperature
Frozen
Specimen Stability
Room temperature: Frozen Only
Refrigerated: Frozen Only
Frozen -20° C: 14 days
Frozen -70° C: 1 year
Refrigerated: Frozen Only
Frozen -20° C: 14 days
Frozen -70° C: 1 year
Methodology
Clot based, Bethesda Assay
Setup Schedule
Sets up 1 day a week.
Report Available
3 days
Clinical Significance
Factor XI Inactivator assay issued to quantitate inhibitor present in patient sample. The Bethesda assay is the most common test for determination of circulating FXI inhibitor in plasma.
