Factor - IX Activity Assay
Also Known As
Test Parameters Included
- Factor IX Activity Percentage (%) - clot-based quantitative measurement
- Pathologist Haematology Remark - correlated against age-adjusted reference intervals for coagulation screening
Department
Methodology
Sample Required
Preparation
Schedule Report
24 Hours
Emergency Report
Yes
Frequently Asked Questions
What does Factor IX Activity Assay measure?
It measures the functional clotting activity of Factor IX (Christmas factor), a vitamin K-dependent coagulation protein. Results are expressed as a percentage of normal pooled plasma activity.
Why is this test ordered?
It is primarily ordered to diagnose and monitor Hemophilia B (Christmas disease), evaluate unexplained prolonged aPTT, assess bleeding tendency before surgery, or monitor replacement therapy with Factor IX concentrates.
Is fasting required for this test?
No, fasting is not required for Factor IX Activity Assay. The sample can be collected at any time of day.
What sample is needed and how is it collected?
The test requires 1 mL of citrated plasma (light blue top tube). Blood is drawn via venipuncture and the sample must be processed promptly to ensure accurate clot-based results.
How long does it take to get results?
Results are typically available within 24 hours. Turnaround time may vary depending on laboratory workload and batch processing schedules.
Can medications affect Factor IX levels?
Yes, anticoagulant therapies such as warfarin can reduce Factor IX activity since it is vitamin K-dependent. Liver disease may also lower Factor IX synthesis. Always inform your doctor about current medications before testing.
Test Description
Test Code
F03
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