SARS-CoV-2 Antigen testing - what you need to know

Test box on table

Everything you need to know about testing for COVID-19 with the Roche SARS-CoV-2 Antigen Self Test Nasal.

Welcome! Here you can find detailed instructions on how to perform the SARS-CoV-2 Antigen Self Test Nasal and more information on testing for COVID-19.

Make sure to follow the steps below carefully

Make sure to follow the steps below carefully

Always read the Instructions for Use carefully.

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Wash your hands...

icon use sanitizer

... or use hand sanitiser.

icon prepare materials

Place the needed material in front of you.

icon keep a timer

Keep a timer to track the readout time.

Always read the Instructions for Use carefully.

icon collect sample

Collect nasal sample

Blow your nose once using a tissue. Open swab packet and make sure to only hold the swab at the bottom. Do not touch the tip. Insert the sterile swab 2 cm into your nostril and rotate the swab 4 times for about 15 seconds against the nasal wall.

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Repeat process

in the other nostril with the same swab.

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Prepare the sample

Insert the swab into the extraction buffer tube, squeeze the tube tight at the bottom and stir the swab more than ten times.

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Remove the swab

while squeezing the sides of the tube. Press the nozzle cap tightly onto the tube.

Always read the Instructions for Use carefully.

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Add 4 drops of extracted sample to the specimen well of the test device.

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Set timer and read the results after 15 minutes and before 30 minutes have passed.

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Risk of incorrect results. Do not read test result after 30 minutes.

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10 - 15 min

Control line C

Confirms the test is working correctly

Test line T

Visible if SARS-CoV-2 antigen was detected

Positive result


Negative result


Invalid result


Positive test result

If both the coloured line C and T are visible the test result is positive. This means the test detected the virus protein in the sample. The tested person is likely infected with SARS-CoV-2.


What now?

You need to self-isolate immediately.


Follow latest advice from the local health authority ...


... you may be required to undergo a PCR test to confirm the test result.

Negative test result

A visible control line C means the test worked correctly. The test result is negative. There was no virus protein detected in the sample.


What now?

There is a very low chance you are currently infectious to others.


Note that this result is only valid for the day you take the test.


Continue to follow local health authority guidance on hygiene and social distancing.

Invalid test result

If there is no line visible, or only the line marked with a T, the test did not work correctly and needs to be repeated with another test device.


What now?

To get a valid result you will have to do a new test (with new test material and new sample).


Make sure to follow the instructions carefully.

Frequently asked questions about testing with SARS-CoV-2 Antigen Self Test Nasal

Frequently asked questions about testing with SARS-CoV-2 Antigen Self Test Nasal

COVID-19 antigen tests perform best when the viral load is at its highest during an infection. Outside of this window, such as at the start of the infection, or late infection, the test may not detect the virus. Therefore, regular testing (such as every few days) increases the chance of detecting COVID-19. Please refer to local health authority guidelines or government websites for further guidance on this topic.

No, according to our instructions for use, the test must be performed by an adult or under close adult supervision on children under 18 years of age.

In this case, do not use the damaged test kit and use a new one. We also recommend you report the damaged kit to wherever you got the test kit. Additionally, we recommend you report the incident to your local Roche customer support centre via our webform.

No, the test should not be used anymore when the expiry date has passed. Please use a new in date test.

The storage temperature range is 2 - 30 °C. You should store the test in a dry, cool place without direct sunlight exposure.

No, when you open the test cassette foil pouch (pouch 1) you have to perform the test within 1 hour. You should discard the test if the test cassette has been outside of the foil pouch for more than one hour.

No, the sample must be collected from both nostrils using the same swab.

According to the instructions for use, you should apply exactly 4 drops of the extracted sample to the test device. If more than 4 drops are added and the subsequent result is negative - we recommend repeating the test to confirm the results. If you have applied less than 4 drops, we recommend repeating the test.

No, the result needs to be read after 15 minutes, but no later than 30 minutes. If you read the result for example after 45 minutes, then your test might show an invalid or incorrect result. Please repeat the test by using a new test kit.

If you get a positive test result it means that it is very likely that you have COVID-19. Please consult local health authority guidelines or government websites for guidance on what to do next. In the meantime, it is important that you adhere to all hygiene and local safety measures and that you adhere to the local guidelines on self-isolation.  

If a negative result is shown in the result window of your test cassette, then it is unlikely that you have COVID-19. However, you should continue to observe and follow all hygiene and local safety measures. Please consult local health authority guidelines or government websites for guidance on what to do next, including re-testing if you still suspect that you may have an infection.

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Safer socialising

Test yourself before meeting your loved ones

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Testing without appointment

This also relieves pressure on our healthcare systems

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More convenient repetitive testing

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Reliable results anywhere

Self-Testing does not require medical assistance

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A step towards normality

and opening up the economy

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A peace of mind

Store some tests at home to have them at your disposal whenever needed

Learn more about COVID-19 and testing

Learn more about COVID-19 and testing

The course of SARS-CoV-2 infections can very widely.

Some people do not have any symptoms, others experience mild symptoms such as fever, cough, loss of taste or smell, or diarrhoea. But it can also cause more serious symptoms such as difficulty in breathing.Usually, it takes 5-6 days for symptoms to develop after an exposure to SARS-CoV-2, but sometimes it can take as long as 14 days.6

illustration - covid sympthoms

e.g. cough and shortness of breath

illustration - covid sympthoms

e.g. sore throat and muscle pain

illustration - covid sympthoms

e.g. fever and headache

An antigen test detects the structural protein N that is present in the virus.

illustration - virus
  1. Spike
  2. Membrane
  3. Virus RNA
  4. Nucleocapsid (N) protein

An antibody test detects the body’s reaction to the virus - the production of antibodies. It cannot detect a current infection, but it can determine if a patient has been infected in the previous months.

illustration - virus
illustration - antibodies

Antibodies produced by immunsystem

A PCR test detects genetic material from the virus (RNA), which is a very sensitive method of testing. For a PCR (polymerase chain reaction) test a laboratory analyser is needed, and it often takes 1-2 days to get the results.

illustration - virus
  1. Spike
  2. Membrane
  3. Virus RNA
  4. Nucleocapsid (N) protein
illustration - virus
  1. Antibodies contained within the test device recognise and react with the nucleocapsid (N) protein, which is produced by the virus and this reaction causes a coloured line.
  2. Sample
  3. Drops from the sample moisten the conjugate pad in the test device.
  4. A substance in the buffer solution causes the reaction for the control line C. This shows you that the test worked correctly.

Any further questions?


We look forward to hearing from you.

  1. SARS-CoV-2 Antigen Self Test Nasal Package Insert 2021-04 V 1.0
  2. Public Health England (PHE). Published December 23, 2020. Accessed June 11, 2021.
  3. FINDDX. Published March 11, 2021. Accessed June 11, 2021.
  4. FINDDX. Accessed 6 May 2021.
  5. WHO. Published September 11, 2020. Accessed 6 Jan 2021.
  6. U.S. CDC. Published February 22, 2021. Accessed June 11, 2021.