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Antithrombin III - Results

Alternative Names

AT III

Normal Values:

Normal value ranges may vary slightly among different laboratories. Talk to your doctor about the meaning of your specific test results.

What abnormal results mean:

Lower-than-normal AT III may mean you have an increased risk of clotting. Abnormal results may not show up until you are an adult.

Examples of disorders and conditions associated with increased blood clotting include:

Deep venous thrombosis
Phlebitis (vein inflammation)
Pulmonary embolus (blood clot traveling to lung)
Thrombophlebitis (vein inflammation with clot formation)

Lower than normal AT III may be due to:

Bone marrow transplant
DIC (disseminated intravascular coagulation)
AT III deficiency, an inherited condition causing lower blood clotting protein levels
Liver cirrhosis
Nephrotic syndrome

Higher than normal AT III may be due to:

Use of anabolic steroids

Reviewed last on: 6/2/2010
David C. Dugdale, III, MD, Professor of Medicine, Division of General Medicine, Department of Medicine, University of Washington School of Medicine; Yi-Bin Chen, MD, Leukemia/Bone Marrow Transplant Program, Massachusetts General Hospital. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.

References

Schafer AI. Thrombotic disorders: hypercoagulable states. In: Goldman L, Ausiello D, eds. Cecil Medicine. 23rd ed. Philadelphia, PA: Saunders Elsevier; 2007:chap 182.

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