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The only situation in which you wouldn't assume that a faint line on a rapid test is positive is if it turned positive after the allotted testing period, Garner says.
"A faint positive line on a home test after recovering from COVID-19 symptoms is an indication of viral proteins being present — therefore, that person may be still contagious."
“A faint line on a COVID test means the test is positive,” says infectious disease expert Amesh A. Adalja, M.D., a senior scholar at the Johns Hopkins Center for Health Security.
COVID-19 rapid antigen tests or RATs, also frequently called COVID-19 lateral flow tests or LFTs, are rapid antigen tests used to detect SARS-CoV-2 infection ().They are quick to implement with minimal training, cost a fraction of other forms of COVID-19 testing, and give users a result within 5–30 minutes.
Accuracy is measured in terms of specificity and selectivity. Test errors can be false positives (the test is positive, but the virus is not present) or false negatives, (the test is negative, but the virus is present). [179] In a study of over 900,000 rapid antigen tests, false positives were found to occur at a rate of 0.05% or 1 in 2000. [180]
A NASA illustration of a lateral flow assay. A lateral flow test (LFT), [1] is an assay also known as a lateral flow immunochromatographic test (ICT), or rapid test.It is a simple device intended to detect the presence of a target substance in a liquid sample without the need for specialized and costly equipment.
If your COVID-19 rapid test turns positive, but the line is faint, unfortunately it still means you have COVID. However, a re-test might be in your future.
For a qualitative test the thresholds for a positive test are generally determined by an hCG cut-off where at least 95% of pregnant women would get a positive result on the day of their first missed period. [11] Qualitative urine pregnancy tests vary in sensitivity.
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