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.
Buying a test for someone else?
Learn how
UK's first direct-to-consumer blood testing service. 
We've delivered over 7.5 million test results. 
We've helped over 200,000 people take control of their health. Biomarker table
Clotting status
PT
Learn more
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
Learn more
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.
Fibrinogen
Learn more
INR
Learn more
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.
Blood testing made easy
How it works
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.
Your results, simplified
Track, improve, and monitor your health over time
MyMedichecks is your personal online dashboard where you can view your results, access clear and simple explanations about individual health markers, monitor changes in your health, and securely store information about your medical history, lifestyle, and vital statistics.
FAQs
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.