From UAB Coagulation Service (http://coag.path.uab.edu)
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Factor XI Activity Assay
| Primary Name |
Factor XI Assay |
| Synonym |
Factor XI Functional Assay |
| Synonym |
-- |
| Contraction |
FXI |
| Contraction |
-- |
| Contraction |
-- |
| UAB Procedure Number |
2500530 |
| CPT Code |
85270 |
| Specimen |
Collect one (1) blue-stopper tube (3.2% sodium citrate), filled to specified volume. Do not underfill or overfill. |
| Specimen Management |
Note time of collection and time of last treatment if applicable. Centrifuge blue-stopper tube within 1 hour of collection, separate plasma and test or quick-freeze at -70°C. |
| Specimen Accepted |
Daily including weekends |
| Times Available |
0730-1600; deliver to lab by 1300 for same-day results |
| Test Performed |
Monday-Friday. |
| Available Stat? |
Pathologist's approval required. |
| Description |
Congenital factor XI deficiency is present in 1:8 Ashkenazi Jews and is inherited as an autosomal dominant mutation. Factor XI deficiency is associated with mild to severe bleeding; however, bleeding severity is not proportional to factor XI activity level. |
| Reference Interval |
50-150% |
| Critical Value |
-- |
| Therapeutic Range |
-- |
| Follow-up Test |
-- |
| Associated With |
Bleeding disorders |
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