Blood Clotting Factor And Familial Hemiplegic Headache

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Definition

The factor VIII assay is a blood test that measures the activity of factor VIII -- one of the substances involved in blood clotting (coagulation).


Alternative Names

Plasma factor VIII antigen


How the test is performed

A blood sample is needed. For information on how this is done, see: Venipuncture


How to prepare for the test

No special preparation is needed for this test.


How the test will feel

When the needle is inserted to draw blood, some people feel...

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