Prothrombin Time with INR

Prothrombin Time with INR

This test may help measure how long it takes for your blood to clot. A healthcare provider may use this to monitor medication in your blood if you are taking warfarin (a type of medication known as a blood thinner which can treat and prevent blood clots). Read more
Test details

Sample type:
You do not need to do anything special to prepare for the sample collection. This test does not require fasting.
Test type: In Person
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+ $6.00 Physician Service Fee
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Our PT/INR Test measures how long it takes for blood to clot.
Must be 18+ years of age to purchase.
Schedule an appointment, then visit a Quest Diagnostics patient service center location.
About the Test

Our Prothrombin Time with INR (PT/INR) Test measures how long it takes for your blood to form a clot (coagulate). Anticoagulants (anti-clotting medications) change the way your blood clots. Warfarin is a commonly prescribed anticoagulant, or blood thinner, that prevents blood from clotting. Anticoagulant therapy must be carefully monitored to make sure the dosage is right for the patient; otherwise, severe and persistent bleeding or excessive blood clotting (hypercoagulation) can occur.

How Does it Work?
Take an in-person test at a Quest Diagnostics location.
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1. Purchase your test
Schedule your appointment after purchasing a test to minimize wait time.
2. Visit a location
Enter your zip code to find a Quest Diagnostics location closest to you.
3. Get results online
We will email you when your confidential results are available. 

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After your purchase, schedule an appointment at a nearby Quest Diagnostics location and have your specimen sample collected by a trained healthcare professional.

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Access test results from your phone as soon as they’re available, with the option to discuss your results with an independent physician at no extra cost.