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There are two blood tests done. They are the antithrombin activity test and the antithrombin antigen test. When looked at together, they are called a functional antithrombin III assay. These tests show how much healthy (functional) antithrombin your body is making. If your levels of functional antithrombin are too low, this can increase your risk for blood clots (hypercoagulable state).
This test checks how much antithrombin your body is making and how healthy it is. Your body makes different types of proteins to control how your blood clots. Antithrombin is a protein that stops your blood from clotting too much. If your body does not make enough antithrombin or makes antithrombin that does not work like it should, your blood may clot too much. This increases the risk of having blood clots travel through your blood system to your lungs (pulmonary embolism) or brain (stroke).
A blood sample is required for this test. It is usually collected by inserting a needle into a blood vessel.
Talk with your health care provider about what your results mean.
This information is not intended to replace advice given to you by your health care provider. Make sure you discuss any questions you have with your health care provider.
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