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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:
- Bile duct obstruction
- Cirrhosis
- Disseminated intravascular coagulation
- Hepatitis
- Malabsorption
- Vitamin K deficiency
- Coumadin (warfarin) therapy
- Factor VII deficiency
- Factor X deficiency
- Factor II (prothrombin) deficiency
- Factor V deficiency
- Factor I (fibrinogen) deficiency
- 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.
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