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The results of these tests can be combined to check how much healthy antithrombin your body is making. Together, these are sometimes called a functional antithrombin III assay. Both are blood tests. Unusually low levels of functional antithrombin 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 prevents too much blood clotting. If your body does not make enough antithrombin, or makes antithrombin that does not work properly, you might be at risk of having your blood 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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