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Prothrombin time (PT) - Results

Alternative Names

PT; Pro-time

Normal Values:

The normal range is 11 to 13.5 seconds. However, "normal" varies from lab to lab.

The PT time will be longer in persons who take blood thinners.

What abnormal results mean:

Increased PT times may be due to:

  • Reviewed last on: 3/9/2007
  • Mark Levin, MD, Hematologist and Oncologist, Newark, NJ. Review provided by VeriMed Healthcare Network.

References

Ferri FF. Ferri’s Clinical Advisor: Instant Diagnosis and Treatment. 2005 ed. St. Louis, Mo: Mosby; 2005:1365.

Hoffman R, Benz EJ, Shattil SS, et al. Hematology: Basic Principles and Practice. 4th ed. Orlando, Fl: Churchill Livingstone; 2005:2004-2005.