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What is a FACTOR XI, FUNCTIONAL?

Factor XI, Functional is a blood test that measures the activity of Factor XI, a protein involved in the blood-clotting process. It helps determine whether Factor XI is functioning adequately to support normal coagulation. The test is needed to investigate unexplained or prolonged bleeding, abnormal activated partial thromboplastin time (aPTT), or suspected Factor XI deficiency. It can also help assess inherited or acquired disorders affecting blood clotting.

Additional Information

Also known as/ Other names: Factor XI Activity, Functional Factor XI Assay, Coagulation Factor XI Functional, Factor XI Functional Assay, Plasma Thromboplastin Antecedent Activity Test
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: 2 Days

FAQs

What does a low Factor XI activity level mean?

A low result indicates reduced Factor XI activity. Depending on the degree of reduction and clinical history, it may suggest Factor XI deficiency.

Is Factor XI deficiency the same as hemophilia A or B?

No. Hemophilia A involves Factor VIII deficiency, hemophilia B involves Factor IX deficiency, while Factor XI deficiency involves reduced Factor XI activity.

Can Factor XI deficiency cause prolonged aPTT?

Yes. Reduced Factor XI activity can prolong the aPTT because Factor XI participates in the intrinsic coagulation pathway.

Can Factor XI deficiency cause a normal PT?

Usually, yes. Because Factor XI is part of the intrinsic pathway, PT is generally normal when Factor XI is the primary deficiency.

What should I do if my Factor XI activity is low?

Discuss the result with your healthcare provider or hematologist. Further evaluation may be needed to determine the cause and assess bleeding risk, particularly before surgery or invasive procedures.

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