Clotting Blood Test, from our experts to you.
Dr Sam Rodgers MBBS, MRCGP

Chief Medical Officer meet our doctors

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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.

clotting test?
Why take a

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's included?

Clotting status
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PT 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.
APTT 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.
INR 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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