Protein s

This is an important test that can be used to investigate protein S deficiency or the cause of blood clots.

Venous blood
1 tests included
5 days turnaround



About Protein s

What is protein S?

Protein S is a protein produced by the body to reduce clotting. A protein S deficiency may result from insufficient protein S levels, loss of function of the protein or whether it is in its free form. This increases the body’s risk of clotting. Blood clots can occur in different parts of the body such as in veins (venous thromboembolism) and must be detected early for treatment. The causes of protein S deficiency may be genetic or acquired.  

Why take the test?

This test measures the level of protein S in the blood and can be used to investigate protein S deficiency or the cause of blood clots.


What's tested

Clotting Status

How it works



Purchase your Kit

Just order a test online and get your kit delivered right to your door unless you are ordering a COVID-19 Fit to Fly test where you will be given appointment options to attend our clinics across the United Kingdom for a nose and throat swab PCR test at the checkout stage.



Take your test and post

Follow our simple instructions to take your sample and post back the enclosed prepaid envelope to our accredited lab for processing. We also offer home or workplace visits by a qualified nurse. For COVID-19 Fit to Fly tests you must attend one of our partner clinics for our trained collection officers to take your sample. You will then have the results emailed to you.



Get results directly to your dashboard

You will receive an email notification from our medical team when your results are available on your secure personalised health dashboard.