Overview of Prothrombin Time
Why Get Tested
- If you have signs or symptoms of a bleeding or clotting disorder like easy bruising, heavy menstrual periods, nosebleeds, swollen and painfol joints
- If you are taking blood thinning medicines like warfarin
- If you have suspected liver disease or vitamin K deficiency
- No special preparation required
What Results of Prothrombin Time mean?
It usually takes 11 to 14 seconds for blood plasma to clot if you are not taking blood thinning medicines. That means the Prothrombin time is usually between 11 to 14 seconds. If you are taking blood thinners like warfarin, the planned INR is between 2 to 3.5.
Some causes of increased PT are:
a. Bleeding or clotting disorder
b. Wrong dose of warfarin
c. Vitamin K deficiency
d. Liver disease
e. Rarely, Factor II or Prothrombin deficiency
Patient Concerns about Prothrombin Time
Frequently Asked Questions