The N protein of the SARS-CoV-2 virus reacts with the stripe-like coating of the test line and, if present, results in a color change, i.e. a red line appears. Therefore, if the sample does not contain any viral proteins or antigens, there will be no red test line (T).

You can test yourself whether you have symptoms or not. Studies show that earlier testing within the first 4 days of illness typically means a higher viral load, which is easier to detect. Since the test result is a snapshot valid for that point in time, testing should be repeated as recommended by local authorities.

Be sure to blow your nose multiple times before collecting the specimen.
Be sure to visibly collect sample material (nasal secretions).
Perform the test immediately after taking the sample.
Follow the instructions for use carefully.
Apply the drops of extraction solution only to the sample well (S).
Too many or too few drops of extraction solution can lead to an invalid or incorrect test result.

Please note that the test card should not be used with more than 3 drops of sample, as the liquid absorption of the test strip is naturally limited. If the control line does not appear or the test strip is badly smudged or discolored, making it unreadable, please repeat the test according to the instructions.

Your test result is invalid. Observe the answer to question 4 and repeat the test according to the instructions for use.

For the result to be positive, 2 straight horizontal lines must be clearly visible with the full width of the cassette. If you are still unsure about the results, contact the nearest health facility according to the recommendations of your local authorities.

If your result is positive and the test kit clearly indicates the control line as well as the test line, then the result must be confirmed by a PCR test. You should immediately contact the nearest medical facility (e.g. your family doctor) by telephone, as recommended by your local authorities. The medical facility will explain the appropriate next steps to take. Avoid contact with other people until the result of the PCR test is available.

If the test kit only clearly shows the control line, this may mean that you are negative or that the viral load is too low to be detected. If you experience symptoms (headache, fever, migraine, loss of sense of smell or taste, etc.), please consult your primary care physician, or the nearest health care facility as recommended by your local authorities. If you are not sure, you can repeat the test. Even with a negative result, continue to adhere to social distancing rules, contact restrictions, and hygiene measures.