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Factor XI Activity and Human Inhibitor
MessageTested at Quest Diagnostics.
This test is currently only available in BHS CPRS. If you are a Bedford provider and wish to see this test offered in Bedford CPRS- please contact the Bedford Laboratory.
This test is currently only available in BHS CPRS. If you are a Bedford provider and wish to see this test offered in Bedford CPRS- please contact the Bedford Laboratory.
Test Code
FACTOR XI ACT & HUMAN INH(O)
CPT Codes
85270, 85335
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
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.
Last Updated: April 3, 2018
