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Partial thromboplastin time (PTT) - Results

Alternative Names

APTT; PTT; Activated partial thromboplastin time

Normal Values:

The normal value will vary between laboratories. In general, clotting should occur between 25 - 35 seconds. If the person is taking blood thinners, clotting takes up to two and a half times longer.

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

The examples above show the common measurements for results for these tests. Some laboratories use different measurements or may test different specimens.

What abnormal results mean:

An abnormal (too long) PTT result may be due to:

  • Reviewed last on: 2/13/2011
  • David C. Dugdale, III, MD, Professor of Medicine, Division of General Medicine, Department of Medicine, University of Washington School of Medicine. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.

References

Schmaier AH. Laboratory evaluation of hemostatic and thrombotic disorders. In: Hoffman R, Benz EJ Jr, Shattil SJ, et al, eds. Hoffman Hematology: Basic Principles and Practice. 5th ed. Philadelphia, Pa: Churchill Livingstone Elsevier; 2008:chap 122.

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