Factor XII Activity
Also Known As
Test Parameters Included
- Factor XII Activity (% of normal plasma)
- Pathologist Haematology Remark - interpreted with aPTT and clinical bleeding/thrombotic history
Department
Methodology
Sample Required
Preparation
Schedule Report
5 Days
Emergency Report
Yes
Frequently Asked Questions
Is fasting required for Factor XII Activity?
No, fasting is not required. The test can be performed on a non-fasting sample.
What sample is needed?
Citrated plasma (1 mL) collected in a light blue top tube. Accurate fill volume is essential for reliable coagulation results.
How is the result interpreted?
Low Factor XII activity suggests deficiency, which may prolong aPTT. However, it rarely causes clinical bleeding and is often an incidental finding.
Does Factor XII deficiency increase bleeding risk?
No, despite its role in the intrinsic coagulation pathway, Factor XII deficiency is generally asymptomatic and not associated with bleeding tendencies.
Can medications affect this test?
Most anticoagulants do not interfere directly. However, liver disease, disseminated intravascular coagulation, or congenital deficiencies of other clotting factors may alter results.
Test Description
Test Code
F33
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