PT Blood Test

This test measures how long it takes your blood to clot.

This test measures how long it takes your blood to clot.

This test measures how long it takes your blood to clot.

  • Your healthcare provider may order this test to see if your blood has trouble clotting or to monitor the effect of drugs which are used to interfere with clotting, such as warfarin (Coumadin).
  • The test results are typically expressed as a number called the INR (International Normalized Ration). The INR provides a way of making the results from different laboratories comparable with one another.

In an adult, the blood sample is usually taken by placing a needle in a vein in the arm or by pricking a finger.

  • No special preparation is needed.
  • Be sure to tell your healthcare provider about the medicines you are taking. Some medicine can interfere with the test.
  • Ask your healthcare provider if you need to stop taking any medicines before the test. Do not stop taking any medicine unless your healthcare provider tells you to do so.
  • This care path's costs do not include the charge to draw blood from a vein (venipuncture).
  • There will only be one charge to draw blood, even if multiple tests are being performed on the samples that are taken.

What should I ask my healthcare provider before having this test?

  • What is the reason for the test? Will the test results change my treatment plan, and if not, do I need the test?
  • Are there concerns with the use and accuracy of this test?


Also known as:

PT Blood Test
Prothrombin time
Laboratory Work
Clotting Time helps consumers determine the average cost of common medical procedures in their location. By gathering and analyzing data from leading insurance providers across the US, patients can compare the estimated price of common medical procedures to determine their approximate out-of-pocket expenses. All rates are approximations and not guarantees based on data that is available to the consumer. There are currently 638 procedures available in our database. These results and the information contained within should in no way take the place of actual medical advice.

Do not avoid getting health care based on the information on this site. Not affiliated with any insurance provider, hospital, or medical professional. Prices are just estimates based on available data, and may vary based on plan, state, and provider. For informational purposes only.