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What is a FACTOR IX, FUNCTIONAL?

Factor IX, Functional is a blood test that measures the activity of Factor IX, a clotting protein essential for normal blood coagulation. The test helps determine whether Factor IX is functioning adequately to support clot formation. It is primarily needed to investigate suspected Factor IX deficiency, including hemophilia B, and to evaluate unexplained or prolonged bleeding and abnormal coagulation results, helping guide further diagnosis and management.

Additional Information

Also known as/ Other names: Factor IX Activity, Functional Factor IX Assay, Christmas Factor Activity, Coagulation Factor IX Functional, Factor IX Functional Assay
Parameters: 1
Recommended for: M/F/Others
Sample Type: Blood
Patient Preparation: Overnight fasting is preferred. It is recommended that the patient discontinues heparin for 1 day and oral anticoagulants for 7 days prior to sampling as these drugs may affect test results. Discontinuation should be with prior consent from the treating physician.
Reports: 4 Days

FAQs

What does a low Factor IX activity result mean?

A low activity level indicates reduced Factor IX function. Depending on the degree of reduction and clinical history, it may suggest Factor IX deficiency or hemophilia B.

What is hemophilia B?

Hemophilia B is an inherited bleeding disorder caused by insufficient or defective Factor IX. It can result in prolonged or spontaneous bleeding, depending on its severity.

Is hemophilia B inherited?

Yes. Hemophilia B is usually inherited in an X-linked pattern and predominantly affects males, while females can be carriers and may sometimes have reduced Factor IX levels.

Can aPTT be prolonged in Factor IX deficiency?

Certainly. Significant Factor IX deficiency can prolong the activated partial thromboplastin time (aPTT), while PT is typically normal.

Can Factor IX levels vary over time?

Yes. Factor IX activity can be influenced by factors such as treatment, liver function, certain medications, and laboratory conditions. Results should be interpreted in clinical context.

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