Lateral flow tests can be have a very faint line.
* This test is positive *
(Confirmed by PCR)
* This test is positive *
(Confirmed by PCR)
This is a common phenomenon with all lateral flow testing. There is no amplification of the sample and so you are only testing what you have - if there isn't much there the line will be faint. You see the same with pregnancy tests (also lateral flow).
They use immobilised antibodies and markers that bind to the antigens on the reservoir pad and then migrate along the test. As they move across binding reagents will bind the target to the test line. The larger the sample of whatever you are testing for the stronger the line.
Any line, even a pale one, should be retested by PCR - which will amplify the sample and enable them to classify which variant is present.
For those struggling you can use filters. I have switched to B/W and cranked up the contrast...
Community testing in Liverpool discovered that they *missed* 60% of PCR positive cases.
Who knows how inaccurate in the hands of teenagers? (No data!)
sciencemediacentre.org/expert-reactio…
Who knows how inaccurate in the hands of teenagers? (No data!)
sciencemediacentre.org/expert-reactio…
If you have symptoms then PCR.
NB/ The symptoms for Delta (99%+ of all UK cases) are different.
These are the top 5 symptoms from ZOE:
NB/ The symptoms for Delta (99%+ of all UK cases) are different.
These are the top 5 symptoms from ZOE:
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