Specimen Requirements
Title
FACTOR XI ACTIVITY
Specimen Requirement
Methodology
Clotting
Stability
Frozen: 7 days
Reference Range
50-150%
Turnaround
5-8 days
Clinical Use
Hemophilia C or inherited Factor XI deficiency is present in 4% of Ashkenazi Jews. Some patients with very low levels of Factor XI deficiency do not exhibit a bleeding tendency. It is possible that Factor XI like activity on platelet membranes may partly compensate for deficiency of the plasma factor.
Test Code
1483