Protein S Blood Test


A blood test to measure levels of the anticoagulant protein S

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Special Instructions
This sample must be taken at our London laboratory.

Protein S Blood Test

About this test

Protein S is a natural anticoagulant in the blood. It works by activating another protein C, which is plays an important role in blood clotting. 

Some people can be deficient in protein S, whihc increases the risk of blood clot formation. This in turn can lead to a raised risk of venous thromboses, which can be life-threatening.

Whilst some cases of protein S deficiency are genetic, its levels can also be reduced by other factors such as having liver disease or a vitamin K deficiency – which may occur in warfarin users.

Who is this test for?

This test is for anyone who has a family history of a protein S deficiency, those who are concerned about their risk of venous thrombosis and those taking vitamin K who want to check that their protein S levels are stable.

How it works

Collect Sample

We send you an easy-to-use kit to collect your blood sample.

Post Sample

Post your sample to our lab in the prepaid envelope provided.

View Results

View results securely in your own personal dashboard.

Important Information

Our tests are not a substitute for seeing your doctor, especially if you are suffering symptoms. Our doctors will interpret your results based on the information you have provided, but will not diagnose, consult or provide any treatment. You will be advised to see your doctor for any necessary follow-up action.

Tests Included

Clotting Status

Laboratory appointment in London

Your Blood sample will be analysed at our chosen laboratory based in the heart of London's medical district. You can be assured of fast, accurate results from the UK's largest independent provider of clinical diagnostic tests

Private laboratory analysis

Your blood sample will be analysed at one of our chosen laboratories. You can be assured of fast, accurate results from one of our accredited independent providers of clinical diagnostic tests.

Interpretation of results

Our medical team will comment on out-of-range blood results and give you follow-up advice where necessary. If you need it, a PDF copy of your Protein S Blood Test results can be downloaded for your doctor.

Secure online account

Once you have placed your order you can visit where you can manage your account, track your orders and view your Protein S Blood Test results.

Health and Lifestyle tracker

Stay motivated by filling in your online health and lifestyle questionnaire and seeing how improvements in your lifestyle can influence your results. Your medical and family history gives us vital information when interpreting your results.

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