Factor XII assay

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The factor XII assay is a blood test to measure the activity of factor XII -- one of the substances involved in blood clotting.

Hageman factor assay

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

There is no special preparation needed for adults.

When the needle is inserted to draw blood, you may feel moderate pain, or only a prick or stinging sensation. Afterward, there may be some throbbing.

Your doctor may order this test if you had abnormal results on the partial thromboplastin time (PTT) blood-clotting test, or if one of your blood relatives was diagnosed with factor XII deficiency.

Review Date: 02/28/2011
Reviewed By: David C. Dugdale, III, MD, Professor of Medicine, Division of General Medicine, Department of Medicine, University of Washington School of Medicine; and 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.

A.D.A.M., Inc. is accredited by URAC, also known as the American Accreditation HealthCare Commission (www.urac.org).

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