INR Testing

International Normalised Ratio testing

  • Monitor treatment & progression of an existing liver condition
  • Track your body's response to anticoagulant medication
  • Same-day appointments available with fast results
Pricing £95
Type of sample taken Blood
Turnaround time 4 - 6 hours
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There are a few reasons you may need a test for INR including taking Warfarin. Our London clinics offer quick & easy INR testing with fast turnaround & all-inclusive price.

For patients taking warfarin, our clinics offer International Normalised Ratio (INR) testing. Warfarin is an anticoagulant, which slows the body’s production of vitamin K, a key factor in blood clotting.

Warfarin is prescribed as a means of preventing blood clots, for patients who have the following conditions:

  • Deep vein thrombosis (in which there is a risk of blood clots forming in the veins of the legs)
  • Pulmonary embolism (a blood clot in the lungs)
  • Atrial fibrillation (a cardiovascular condition that causes irregular heart rate)

Regular testing is required for patients taking warfarin in order to ensure that the medication is working. The INR test monitors the time it takes for your blood to form a clot, with a target range of 2 to 3.

The blood test is done at our private clinic via a full blood draw, and sent to our laboratory for analysis.

What you eat and drink can affect your treatment as well. Do not change your diet without discussing it with your doctor first.

If you require an appointment for INR testing, please call us or book online.

When should I get tested?

Your doctor should advise you regarding the frequency with which you have your INR tested; once you have agreed on a test schedule, it should be rigorously adhered to.

What does the test include

The test involves taking blood, usually from a vein in your arm, near the elbow.

What to Expect

Step 1

Preparing for test

It is always recommended that, for a blood test, you arrive well-hydrated.
Step 2

During the test

The doctor or nurse will discuss the procedure with you & then take a small sample of blood from your arm. Your results will be sent to the laboratory.
Step 3


We will email the results to you as soon as we receive them from the laboratory. If one of our doctors recommended the test for you, the doctor will call you to discuss the results. If the test was recommended by your own doctor, you can take the results to them.