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Coronavirus Antigen (SARS CoV-2 RNA) Testing (COVID-19)

The Coronavirus Antigen (SARS CoV-2 RNA) test is also known as a SARS-CoV-2 Antigen or Severe Acute Respiratory Syndrome Coronavirus 2 Antigen test.

All you need to know about testing Coronavirus Antigen (SARS CoV-2 RNA) levels with a laboratory test

  • What is the Coronavirus Antigen (SARS CoV-2 RNA) test for?
  • What should I do if the test results are negative?
  • What should I do if the test results are positive?
  • How should I interpret the results of the test?
  • How long does it take to get the results of the Coronavirus Antigen (SARS CoV-2 RNA) test?
  • How do I use the Coronavirus Antigen (SARS CoV-2 RNA) test kit?
  • How does the Coronavirus Antigen (SARS CoV-2 RNA) test work?
  • What symptoms can the Coronavirus Antigen (SARS CoV-2 RNA) test help diagnose?
  • What is the Coronavirus Antigen (SARS CoV-2 RNA) test kit?

What Is The Coronavirus Antigen (SARS CoV-2 RNA) Test For?

Testing for the COVID-19 antigen can identify whether you are currently infected with Coronavirus (SARS-CoV-2) and have an active infection.

The COVID-19 disease - Severe Acute Respiratory Syndrome coronavirus 2 (SARS-CoV-2) - is a respiratory tract infection, with common symptoms including a continuous cough.

Samples are taken from the upper respiratory tract using a nasal/throat swab.

COVID-19 antigen testing should be conducted between 1 and 5 days after the onset of symptoms. 

How To Test Coronavirus Antigen (SARS CoV-2 RNA)

By buying a laboratory test kit with professional nurse or clinic collection, you can accurately measure Coronavirus Antigen (SARS CoV-2 RNA) for total reassurance.

Professional analysis in an accredited laboratory ensures rapid result delivery.

Tests which include a Coronavirus Antigen (SARS CoV-2 RNA) test:

Who Should Take This Test?

Measure your Coronavirus Antigen (SARS CoV-2 RNA) levels and with a nurse or clinic test kit

You get the convenient testing with the reassurance of professional clinical analysis. Your results are delivered quickly & securely online.

This Test is advised if you:

  • want the convenience of home testing without waiting for a GP appointment;
  • need a high quality, clinically accredited test done in a professional clinical laboratory.

What should I do if the test results are negative?

A negative test result suggests that you were not infected with the SARS-CoV-2 virus at the time of the test. However, this doesn't mean that you won't contract the virus in the future. Continue to follow government guidance to reduce the risk of transmission.

What should I do if the test results are positive?

If your results are positive, it means you are currently infected with the virus. Follow the latest advice from the UK Government and your healthcare provider, which will likely include self-isolation and informing close contacts about your results for their safety and care. Urgent medical advice should be sought if your symptoms worsen.

How should I interpret the results of the test?

A positive result indicates that you're currently infected with the SARS-CoV-2 virus. A negative result suggests that you were not infected at the time of test. However, it doesn't exclude the possibility of a recent or future infection. For accurate interpretation of your results and advice on the next steps, consult with a healthcare provider.

How long does it take to get the results of the Coronavirus Antigen (SARS CoV-2 RNA) test?

Once the lab receives your sample, the analysis typically takes a few days. It's important to remember that processing times can vary depending on the lab's current workload.

How do I use the Coronavirus Antigen (SARS CoV-2 RNA) test kit?

The test involves a simple finger-prick method for blood collection. You will be provided with detailed instructions along with the kit to assist with the sample collection process. Once collected, the sample is sealed in the provided safe container and sent back to a UKAS accredited lab for analysis.

How does the Coronavirus Antigen (SARS CoV-2 RNA) test work?

After self-collection of a blood sample from your fingertip, it is sent back to a UKAS accredited lab for analysis. The test identifies the RNA of the SARS-CoV-2 virus. If the RNA is present, it indicates that the individual is currently infected with the virus.

What symptoms can the Coronavirus Antigen (SARS CoV-2 RNA) test help diagnose?

While the test directly identifies the presence of viral RNA rather than diagnosing symptoms, it can help confirm if symptoms such as fever, persistent dry cough, or loss of taste or smell could be due to COVID-19. However, a negative result does not necessarily rule out infection, especially if symptoms persist. Always seek medical advice if you're feeling unwell.

What is the Coronavirus Antigen (SARS CoV-2 RNA) test kit?

The Coronavirus Antigen (SARS-CoV-2 RNA) test kit is a diagnostic tool used to detect the presence of SARS-CoV-2, the virus causing COVID-19. This test is particularly useful for identifying individuals currently infected with the virus, as it detects the presence of viral RNA. To use the test, a sample is self-collected from your fingertip using the finger-prick method.

Medical review

Doctors, Scientists & Experts Delivering Private Blood Testing Online

Dr. Shahzaib Ahmad MBBS, BSc, MRCP, FRCA, FFICM

Clinical Supervisor - Vitall|GMC 7495062|Profile

Dr Shahzaib Ahmad is a Consultant in Intensive Care Medicine with subspecialty experience in cardiac critical care and neurocritical care. He has extensive experience managing complex acute and cardiovascular conditions in hospital intensive care settings. Dr Ahmad supports Vitall in reviewing health content for clinical accuracy and alignment with current medical practice.

Reviewed on 17/11/2025

Next review due 17/11/2026

Review focus: Blood biomarkers, laboratory testing methodology, and biochemical interpretation.

This content has been reviewed for medical and scientific accuracy but does not replace advice from a qualified healthcare professional.

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