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Factor XI Activity and Human Inhibitor
Test Code17854X
Preferred Specimen
TWO Light Blue Tops
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
Reference Range
| Factor XI Activity | 65-150 | %normal |
| Factor XI Human Inhibitor | <0.4 | Bethesda unit |
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.
