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