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BioSURE COVID-19 ANTIBODY SELF TEST

Understanding your antibody status can help you make more informed decisions about your well-being and health risk.


The BioSURE COVID-19 IgG Neutralising Antibody Self Test is Europe’s first CE marked true self test that detects protective neutralising antibodies made as a consequence from SARS-CoV-2 (COVID-19) natural infection and as an immune response to vaccination.


The BioSURE COVID-19 IgG Antibody Self Test is supplied as a complete kit, with all components.

  • Requires only a fraction of a drop of blood (2.5μL finger prick)
  • Result in just 20 minutes
  • In-built true sample control line that will only appear if sufficient blood is applied to the test.
  • 98.2% sensitivity and 99.7% specificity
  • CE Marked by independent Notified Body specifically for self-testing
  • Developed and manufactured in the UK
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It is now accepted that antibody levels decline over a period of about 6 months, whether your immune system has created these in response to either natural infection or vaccination.

The number of cases is now back on the rise, with the number of infections in fully vaccinated people rising steadily, currently at about 30% of all cases.

Knowing whether you have protective antibodies is more important than ever. The strength of the positive line on your test can vary and some can be quite faint, but the strength of your line does correlate to the amount of antibodies in your blood and even a faint line means there are detectable levels of neutralising antibodies, giving you a 50% reduced risk of suffering severe symptoms.

Why test for Antibodies?

When a person has recovered from COVID-19 infection and/or has received COVID-19 vaccination, their body produces antibodies. IgG antibodies are retained and ‘neutralising antibodies’ are created. These neutralising antibodies offer protection from COVID-19 infection as they block the spike on the outside of the virus from being able to enter and infect cells.

  • Suitable for testing for neutralising IgG antibodies from 14 days post infection/vaccination.
  • It is confirmed that Covid-19 IgG antibodies decline over a period of time.
  • The only way to know your status is to regularly test.
  • Knowledge is power and understanding your status can help you make better informed choices.
  • Routine testing is recommended to regularly monitor your levels of protection.

How does it work?

The BioSure Covid-19 IgG Antibody Self Test is incredibly simple to use.

  1. Prick your finger.
  2. Collect just a drop of blood collected using a novel barrel design that collects the correct blood sample size.
  3. Poke the testing device into the pre-filled buffer pot.
  4. Then wait 20 minutes for the results.

Detailed instructions on the testing process and how to read the results are all available in the uniquely designed box.

Still not sure how it works? Why not watch the video on how to perform the test below.

Test Sensitivity

Clinical sensitivity means how reliably your test will give you a true positive result if you have detectable levels of neutralising antibodies to SARS-CoV-2 in your blood.

Your BioSURE COVID-19 IgG Antibody Self Test has a proven sensitivity of 98.3%. This means that, on average, 983 in every one thousand people who have neutralising antibodies will be correctly identified and get a positive test result.

Test Specificity

Clinical specificity means how reliably your test will give you a true negative result if you do not have detectable levels of neutralising antibodies to SARS-CoV-2) in your blood

Your BioSURE COVID-19 IgG Antibody Self Test has a proven specificity of at least 99.7%, meaning on average only three in every one thousand people who test but do not have neutralising antibodies in their blood will be incorrectly identified and get a false positive test result.

Frequently Asked Antibody Test Questions

What is an antibody?

Antibodies are specialised proteins that your immune system produces in response to a foreign substance. They work like a lock and key and in the case of the coronavirus, the neutralising antibodies blocking the spike on the outside of the virus, to prevent it being able to enter and infect your cells. It takes your body a little while to make these, so we recommend you do not test until 14 days after your infection or second vaccination.

Why do antibodies decline over time?

It is quite natural for antibody levels to decline after a person has recovered from a disease, as there is no longer a pathogen (because it has been defeated) to keep them stimulated, but your immune system does have a memory. These are called T-cells and B-cells which are the cells that learn about the pathogen so that they can protect you in the future by producing the appropriate, specific antibodies.

What is the antibody ‘window period’?

This is the time between infection and when your test can correctly give a positive result. During this period someone who has been infected with COVID-19 could get a negative test result if they have not produced enough antibodies to the virus.

How does the Covid-19 vaccine work?

Most of the approved COVID-19 vaccines are currently mRNA vaccines https://www.cdc.gov/coronavirus/2019-ncov/vaccines/different-vaccines/mrna.html, which are a new (but not unknown) type of vaccine. mRNA vaccines do not use live virus so it cannot give you COVID-19 and messenger RNA (orMRNA) is genetic material that tells your body how to make protein that will trigger an immune response. When you are vaccinated with COVID-19 mRNA it teaches your immune system how to make copies of the spike protein, so that if your body is exposed to the actual virus it will recognise it and know how to fight it off.

What is a Covid-19 Antibody Self-Test?

A COVID-19 Antibody self-test must be specifically CE marked by a Notified Body as a self-test for use by people who are not trained. Keep an eye out on the packaging, as the Notified Body number must be stated under the CE mark log. The BioSURE COVID-19 IgG Antibody Self Test is specifically designed and CE marked for self-testing, and is designed to detect neutralising antibodies to SARS-CoV-2 (the virus that causes COVID-19) at home or wherever is convenient for you.

How does the antibody test work?

The technology we use is very similar to a pregnancy test and is commonly called ‘lateral flow’ (because the solution of buffer and sample flow laterally along the test strip), but our self-test detects specific neutralising antibodies to SARS-CoV-2 in your blood sample. When your body detects something harmful (like a bacteria or a virus) your immune system begins to produce antibodies to try and defend your body. Each type of antibody is unique, and everybody makes them at different rates.

What is the difference between a Covid-19 antigen (Swab) test and a Covid-19 antibody test?

A COVID-19 antigen test tells you if you have the virus at the particular time of testing (that is why you need to use it for things like travel and event entry) Generally these types of test need a throat or nasal swab sample and there are two main types of antigen test – a PCR test which is performed in a lab and a rapid test (now commonly known as a lateral flow test or LFD) that gives you your result in about 30 minutes. An antibody test tells you if you have antibodies.

What is the difference between the BioSure Covid-19 Antibody Self-Test and other antibody rapid tests that are available?

Firstly, other antibody rapid tests that are available are not CE marked for self-testing. Secondly, there are two main different types of antibodies – nucleocapsid antibodies (which appear after an infection) and spike antibodies (which appear after an infection or vaccination) which are the neutralising IgG antibodies – the ones that are important for you to know your status about. Most antibody rapid tests, especially those manufactures in China, only detect the nucleocapsid antibodies which you do not produce from vaccination. Our BioSURE IgG Antibody Self Test detects the IgG spike antibodies that bind to the SARS-CoV-2 spike protein, which is the part that the virus uses to infect human cells. This is why they are called neutralising antibodies. The BioSURE COVID-19 IgG Antibody Self Test  holds more significance owing to the neutralising capabilities of IgG antibodies (as opposed to detecting antibodies to the Nucleocapsid protein).

Why should I wait until 2 weeks after my symptoms started for my negative test result to be reliable?

People produce antibodies at different rates and at different times after becoming infected. Most people have made these antibodies within 10 days and around 95% of people in 17 days, some people produce them much later. It is thought that around 5% of people will not create detectable levels of antibodies.


Still have Questions?

Should you require any additional assistance or information you can contact us on 0203 677 0009 or send us an email using our Contact Form.

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