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Covid-19 Vaccine Spike Antibody


 Roche Elecsys® Anti-SARS-CoV-2 S test confirms & quantifies the exact number of antibodies detectable to the spike protein of Covid-19 vaccines or a past infection.

CE marked. Simple finger prick home blood test.

In stock

In stock   |   Free Delivery

About this health test

Covid-19 Vaccine Antibody Test [ Have I made antibodies to the vaccine? ]

This test determines and quantifies the number of antibodies after a Covid19 vaccination & past infection.

Roche Elecsys® Anti-SARS-CoV-2 S tests the quantitative determination of antibodies against the SARS-CoV-2 in serum.

  • The spike protein is the target of many COVID-19 vaccines including the Pfizer, Moderna & Oxford AZ vaccines. This blood test enables determination of both the presence and level of antibodies to the COVID spike protein.
  • This test can signal whether a person has already been infected and has potentially developed immunity to the virus.
  • This test plays an important part in characterising a vaccine-induced immune response

This Roche assay provides a sensitivity of 99.98% and a specificity of 98.8%.

Simple finger prick capillary blood test to be taken at home and sent to our partner laboratory. CE Marked.

Who should take this test? 

If you have had a Covid-19 vaccine at least 14 days or more and want to confirm the presence of antibodies.

This test detects the presence of antibodies to SARS-CoV-2 S which is the spike protein of the deactivated virus. Antibodies are produced in the majority of patients as a result of vaccination.

The host immune system reacts to the vaccine by producing antibodies from a few days to 2 weeks and beyond.

The level of antibodies allows identification of people who have antibodies secondary to their vaccination. The length of time that these antibodies remain detectable differs from person to person.

This test may also confirm antibodies to a previous infection to Covid-19. The results do not differentiated if they have been formed by the vaccine or an infection.


What do the results show? 

The results will show either a POSITIVE or NEGATIVE result.

Unlike many other tests it will also QUANTIFY the exact number of antibodies detected. The results will be show a result between: 0 to >2,500 units/ml.


Does everyone get antibodies after the vaccine? 

  • Not everyone will develop an antibody response to COVID infection or vaccine.
  • Timing of seroconversion following vaccine ≥ 14 days.
  • Results from different manufacturers of commercial assays should not be compared
  • Results for patients who have undergone a plasma infusion or are immunocompromised should be interpreted with caution.


Test Results Example


 What is included?

Roche Elecsys® Anti-SARS-CoV-2 S Home Test Kit

 Recorded, next working day delivery of your test kit (if booked before 3.30pm Mon-Fri)

✓ 24hr Tracked Royal Mail Return

 Results 2-3 working days from receipt by the laboratory

 Patients emailed with results & analysis by a ZoomDoc GP



When to test

We would advise patients to only undertake this antibody test Monday to Thursday and then sending it directly back to our partner laboratory. This ensures that there are no delays with our lab receiving your test.


✓ Roche Elecsys® Anti-SARS-CoV-2 S Test confirms the presence of antibodies to the spike protein of Covid-19 vaccines

This test will provide a POSITIVE or NEGATIVE result & Quantify the number of antibodies detected.

Frequently Asked Questions

  • Will this test show if I have antibodies to either Covid-19 vaccine?

    Yes - this spike protein antibody test will confirm if you have developed antibodies to either the Pfizer or AstraZeneca Covid-19 vaccines.

    It specifically looks at antibodies to the spike protein.

    This test will also confirm if you have antibodies to a previous Covid-19 infection although it does not differentiate if the antibodies found are secondary to an infection or the vaccine itself.

  • What will these results show?

    This antibody test will show a Positive or Negative result.

    It will quantify the exact number of antibodies that are detected in your finger prick blood sample: between 0 to >2,500 units/ml.

  • How accurate are ZoomDoc Wellness Tests?

    ZoomDoc finger prick blood tests are as accurate as tests you would normally take via a normal regular blood test at hospital or in a GP setting.

    All tests are analysed in labs in the UK and are undertaken in a UKAS & ISO 15189 laboratory.

    All of our partner laboratories undergo frequent quality control checks to ensure they meet the highest standard of testing. The equipment and analysers used are all designed for the specific function of capillary blood testing. All ZoomDoc test kits come with clear instructions.

  • What laboratories do ZoomDoc use?

    All laboratories that ZoomDoc use are UKAS & ISO 15189 accredited.

    Most samples are analysed at The Doctors Laboratory which is based in Central London. This lab is the largest private laboratory in the UK.

  • How are my tests reviewed?

    All test results are analysed by our team of Doctors.

    They will comment on your results and often provide both advice and health recommendations.

    If there is any worrying results our Doctors will get in touch and advise on next steps.

  • Is this test suitable for children?

    ZoomDoc do not recommend purchasing our wellness tests for children.

  • Can I discuss my results with a ZoomDoc GP?

    Our team of GPs are always on hand via the ZoomDoc app to discuss any queries or questions you may have with your results or wellness tests.

  • What will happen after purchasing a Wellness Test?

    After purchase of your test kit, it will be immediately dispatched to your home or workplace. After it arrives, you must activate the test with the details of the patient undertaking the test. There are full instructions on the test kit box.

  • Can I give my test to someone else?

    Yes, if you receive or order a wellness test kit and want to gift it to someone else, you can do this. However, the test must always be activated with the personal details of the individual taking the test.

Get in touch
We’re happy to help

If you have any queries please check our list of frequently asked questions or get in touch with one of our experts who will be happy to help.

How to Take Your Blood Test


”At ZoomDoc, we have supported thousands of patients during the Covid-19 pandemic. Our amazing Trustpilot reviews are testament to the high quality service that our team of Doctors provide.

This simple finger prick blood test will determine and confirm if you have had an antibody response to either the Pfizer or AstraZeneca Covid19 vaccine. It will also show antibodies from a previous infection to Covid-19. Unlike many other tests available – this test will also quantify the exact number of antibodies detected: between 0 to >2,500 units/ml. “

Dr Kenny Livingstone. GP & ZoomDoc Chief Medical Officer.

In stock

In stock   |   Free Delivery