Factor XI Activity
Also Known As
Test Parameters Included
- Factor XI Activity (%) - clot-based quantitative measurement of intrinsic coagulation pathway function
- Pathologist Hematology Remark - correlated with reference intervals for bleeding risk assessment
Department
Methodology
Sample Required
Preparation
Schedule Report
24 Hours
Emergency Report
Yes
Frequently Asked Questions
Is fasting required for Factor XI Activity test?
No, fasting is not required. This is a coagulation study and can be performed on a non-fasting sample.
What does Factor XI Activity measure?
It measures the functional activity of Factor XI (Plasma Thromboplastin Antecedent) in the intrinsic pathway of the coagulation cascade, expressed as a percentage of normal pooled plasma.
What causes low Factor XI Activity?
Low levels indicate Factor XI deficiency (Hemophilia C), an inherited bleeding disorder. It can also be reduced in liver disease, vitamin K deficiency, or consumptive coagulopathies.
How is the sample collected?
The test requires 1 mL of citrated plasma collected in a light blue top (3.2% sodium citrate) tube. The sample must be filled to the correct volume for accurate citrate-to-blood ratio.
What is the turnaround time?
Reports are typically available within 24 hours. Stat processing may be available at additional charge.
Can medications affect Factor XI Activity results?
Certain anticoagulants and liver-affecting medications may influence results. Inform your doctor about all current medications before testing.
Test Description
Test Code
F32
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