Prothrombin time (PT)

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PT; Pro-time

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.

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

Review Date: 03/09/2007
Reviewed By: Mark Levin, MD, Hematologist and Oncologist, Newark, NJ. Review provided by VeriMed Healthcare Network.