Factor XI Activity Assay  Email this article           Printer friendly page

Primary Name Factor XI Assay
Synonym Factor XI Functional Assay
Synonym --
Contraction FXI
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
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 None
Follow-up Test --
Associated With Bleeding disorders
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