PTT 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 help determine your blood's ability to clot. It may also be done to monitor the effect of heparin, a drug used to interfere with clotting. It is often ordered to try to find out why someone has a tendency to bleed.
  • Heparin can be prescribed for patients who have had a heart attack or a blood clot.
  • If the risk of developing a blood clot is high, heparin is often used to prevent a clot from forming.
  • Other anti-clotting medications are monitored with tests other than PTT. Some anti-clotting medications do not require ongoing monitoring.

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.
  • 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.
  • The costs in this care path 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? If not, do I need the test?
  • Should I be taking a different anti-clotting medication? If so, should I be monitored with a different test?

Source UHC.com

Also known as:

PTT Blood Test
Partial Prothrombin Time
Laboratory Work
Clotting Time


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