A colored line appears in the top section of the result window to show that the test is working properly. This is the control line (C). Even if the control line is faint or not uniform, the test should be considered to have been performed properly. If no control line is visible, the test is invalid. In the case of an invalid result, perform QC and repeat the test.
In case of a positive result, one or more colored lines appear in the lower section of the result window. These are the test lines of SARS-CoV-2 (S), Influenza A (A) and Influenza B (B). Even if the test line is very faint or not uniform, the test result should be interpreted as a positive result.