Lupus Anticoagulant Blood Test
    Lupus Anticoagulant Blood Test
    Lupus Anticoagulant Blood Test
    Lupus Anticoagulant Blood Test

Lupus Anticoagulant Blood Test

£199

Experiencing unexplained blood clots, recurrent miscarriages, or concerns about your clotting function? This test helps assess whether your blood is clotting properly and is often used to investigate antiphospholipid syndrome (APS) — a condition that increases the risk of thrombosis and pregnancy complications. It measures key clotting markers, including the Dilute Russell Viper Venom Time (dRVVT) test, which evaluates how certain antibodies may interfere with normal blood clotting.

You'll need to visit The Doctors Laboratory in London to collect your sample as the sample is not suitable for posting.

  • Results estimated in 5 working days
  • Convenient testing options
  • Bespoke doctor’s report
  • Free delivery

Includes prothrombin time (PT), activated partial thromboplastin time (APTT), international normalised ratio (INR), dRVVT normal control, and dRVVT ratio to assess clotting function and potential risks linked to APS.

How do you want to take your sample?

  • Book a venous draw at a clinic   Venous
    +£35

    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.

18+ only. T&Cs apply.

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You have the flexibility to choose what works best for you. Enjoy the comfort of having a friendly nurse visit your home for a quick blood draw, opt for a convenient visit to one of our nationwide partner clinics, or self-arrange a draw at a location that suits you.

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What's in the test?

Clotting status

PT

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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.

APTT

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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.

INR

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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.

dRVVT normal control

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Venom from the Russell's Viper snake causes blood to clot more quickly, whilst antiphospholipid syndrome slows down the speed at which blood clots. This test compares the time taken for a patient's blood sample to clot when it is mixed with Russell's Viper venom, and compares it to the speed for a control blood sample to clot .By dividing the time taken for the patient's sample to clot by the time taken for the control sample to clot a ratio is created, this helps to correct for the variability that can happen in reference ranges across laboratories. People who have antiphospholipid syndrome will clot more slowly, so the DRVVT ratio will be increased. DRVVT control is the time taken for the control sample to clot.

dRVVT ratio

Learn more

Venom from the Russell's Viper snake causes blood to clot more quickly, whilst antiphospholipid syndrome slows down the speed at which blood clots. This test compares the time taken for a patient's blood sample to clot when it is mixed with Russell's Viper venom, and compares it to the speed for a control blood sample to clot.By dividing the time taken for the patient's sample to clot by the time taken for the control sample to clot a ratio is created, this helps to correct for the variability that can happen in reference ranges across laboratories. People who have antiphospholipid syndrome will clot more slowly, so the DRVVT ratio will be increased.

How to prepare for your test

Test limitations

This test evaluates blood clotting activity but doesn’t directly measure lupus anticoagulant antibodies. Further autoimmune or clotting tests may be needed for a full assessment.

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