Clotting Blood Test
    Clotting Blood Test
    Clotting Blood Test

Clotting Blood Test


Monitor the clotting ability of your blood to assess clotting disorders and bleeding problems.

For this test, you will be required to visit The Doctors Laboratory in London to collect your sample as the sample is not suitable for posting.

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Results estimated in 3 working days

View 4 Biomarkers

How do you want to take your sample?

Please choose one option below
  • Book a venous draw at a clinic   +£35.00

    Visit one of our national clinic partners for a nurse to take your venous blood sample from a vein in your arm. We’ll email you instructions on how to book after we’ve processed your order.
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Is it for you?

Do you take warfarin or another anticoagulant? Monitor your condition, clotting disorders, and bleeding problems from home with our Clotting Blood Test.

Biomarker table

Clotting status


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Prothrombin is a plasma protein produced by the liver. A prothrombin time test measures how long it takes for the blood to clot. Clotting is caused by a series of clotting factors activating each other, including the conversion of prothrombin to thrombin.


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APTT, or Activated Partial Thromboplastin Time measures the speed at which blood clots in the body are formed, through a route known as the intrinsic pathway.


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The international normalised ratio (INR) is a laboratory measurement of how long it takes for blood to form a clot. This can be useful to be able to determine the effects of anticoagulants such as warfarin on the clotting system.
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Your personalised, actionable health results are only a few clicks away. Order your test, take and post your sample, then view your results online with our doctors' comments.

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Why take a clotting test?

Clotting (or coagulation) tests often monitor people taking anticoagulants - medications that decrease the blood's ability to clot. Often, anticoagulant medications are prescribed if you have a heart attack or stroke. People with irregular heartbeats may also take anticoagulants to prevent a first or recurrent stroke.

How is clotting measured?

Our test evaluates the clotting tendency of blood and the time it takes for clots to form using the standard measures of prothrombin time (PT), APTT, and the International Normalised Ratio (INR), which comes from PT. INR typically helps to inform dosage for those taking anticoagulants and to monitor progress over time.

What happens if blood doesn't clot properly?

Some conditions can prevent blood from clotting properly, either causing the blood to clot too quickly or causing blood clots to remain in the body for too long.

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