Prothrombin time test


The prothrombin time, sometimes referred to as PT or pro time test, is a test to evaluate rake curdle .
Prothrombin is a protein produced by your liver. It is one of many factors in your rake that aid it to clot appropriately .

Why it’s done

Most often, the prothrombin time is monitored if you are taking the blood-thinning medication warfarin. In this site, the prothrombin time is expressed as an international normalize ratio ( INR ).

Your doctor may recommend a prothrombin time test prior to surgery if there is any concern about your blood ‘s ability to curdle .
The prothrombin time test may besides be performed to evaluate you for liver-colored disease. It is one of several tests used to screen people waiting for liver transplants. That screening — known as the exemplary for end-stage liver disease ( MELD ) — is a seduce system for assessing the severity of chronic liver-colored disease .
If your repair suspects you have other health issues, such as liver problems or a bleed disorder, you might need extra testing to confirm your condition .


A prothrombin time test is like to any early lineage test. You might experience tenderness or minor bruise at the web site in the arm where your blood is drawn .

What you can expect

During the test

Obtaining the lineage sample for prothrombin time testing normally takes precisely a few minutes, like any other blood test .

After the test

Your blood might be sent to a testing ground for analysis. If the lab analysis is done on-site, you could have your test results within hours. If your doctor sends your blood to an off-site testing ground, it may take several days to receive the results.

In some anticoagulation clinics, a nurse will take a sample of your lineage with a finger stay, and give you the test resultant role within minutes, while you are silent in the examination room .

Home testing

home testing kits are available for people who have to take lineage thinners for long periods and who have been trained in taking blood samples and testing them .


Prothrombin time test results can be presented in two ways .

In seconds

The average meter range for blood to clog is about 10 to 13 seconds. A number higher than that compass means it takes blood longer than common to clot. A numeral lower than that range means blood clots more promptly than normal .


This proportion — which allows for easier comparisons of screen results from different laboratories — is used if you take blood-thinning medications .
In goodly people an INR of 1.1 or downstairs is considered convention. An INR roll of 2.0 to 3.0 is by and large an effective therapeutic range for people taking warfarin for disorders such as atrial fibrillation or a lineage clot in the leg or lung. In certain situations, such as having a mechanical kernel valve, you might need a slightly higher INR .
When the INR is higher than the recommend image, it means that your blood clots more lento than desired, and a lower INR means your blood clots more cursorily than desired.

What your results mean

Clotting too slowly

rake that clots excessively lento can be caused by :

  • Blood-thinning medications
  • Liver problems
  • Inadequate levels of proteins that cause blood to clot
  • Vitamin K deficiency
  • Other substances in your blood that hinder the work of clotting factors

Clotting too fast

lineage that clots excessively cursorily can be caused by :

  • Supplements that contain vitamin K
  • High intake of foods that contain vitamin K, such as liver, broccoli, chickpeas, green tea, kale, turnip greens and products that contain soybeans
  • Estrogen-containing medications, such as birth control pills and hormone replacement therapy
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Category : Healthy