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I suggest that they are trying to keep the system as streamlined as possible, and thus not requiring other bodies to get involved. Using only LFT means it is entirely kept between school and family, without having to organise a PCR test, go get it done and have labs processing those and getting the result back. It indicates that they are hopeful of relatively low number of cases, although with a false positive of 1-1000, everytime the 3.5M children are tested, around 3500 will be false positive.
God only knows EkXoc. A test can't be both new and gold standard at the same time and it will take some time to dislodge RT-PCR as gold standard
what on earth are you talking about wallbrooke?
One of the main scientists a lady said they had been running the schools testing with LFT for 8 weeks it was accurate to 1 false positive in a thousand no test is 100 percent and added the LFT test is a Good one.
The Government have now confirmed that if you have taken a positive LFT at home and subsequently get a negative PCR your child can return to school and the household does not have to isolate. This contradicts or rather clarifies the incorrect comment made by government minister this morning.
What are you fools talking about???? The LFT that omega are.makingnis next generation rapid test gold standard as accurate if not more than the swabs PCR but because its new they are giving double protection until they have more data the derampers are rife on here because they want.to buy back in under 90p
Agree Cornish, never simple.
Really you would have to do a second test from a different batch, and a different person supervising the test, and really you would want to do a third and even fourth confirmatory test.
But the point is you get ever decreasing chances of false positives.
Aberdeenman
The key is that you are not testing for the positive case in an individual. You are breaking transmission. A positive result is useless when the infectious period is over. This is where the antibody test comes in very handy. It proves you are post the infectious stage, regardless if it was vaccination or natural infection.
How many kids with a positive test, false or otherwise, want to stay at school? They would be out the door and back home before you even had the second test unwrapped (speaking from my own experience of school all those years ago).
Also, that person could be walking around, infectious, whilst the lab do the turnaround on the sample.
Good material for us to create tweets and fight back
God knows why the media don't say this. Political agenda or incompetence
PCR will also confirm a positive case way past the infection period of the infected person. LFT's detect high viral loads, when that person is infectious.
Good point, why dont they just say it on TV then!
@Aberdeenman: depends on why you get a false positive. If the sample contains somethings that cross reacts with the test reagent, then repeating the same test is likely to get the same result. You're only going to get a different result if either the technique was wrong - and an inadequate sample is more likely to give a false negative than a false positive; or there was a fault with the test kit - in which case it might be important to use a different batch for repeat
It's a bit like asking the same person the same question twice. You're probably going to get the same answer
Id say PCR is prone to more false positives that LFT tbh when used for infectious disease testing,
"Is this a cost cutting exercise ? I expect the governemnt to be cutting back on things money is very tight.
They recon 1:1000 kids wil be false positive"
Get a positive, just do another LFT, chances of two false positives in a row is 1:1000000 (1,000 times 1000)
Who needs PCR for accuracy with those numbers.
False negatives may be a different story.
Aberdeenman
* that should read "...isn't that well understood..."
"Is this a cost cutting exercise ? I expect the governemnt to be cutting back on things money is very tight.
They recon 1:1000 kids wil be false positive, if there 3 mil secondary schoolers then thats 3000 missing school for two week plus siblings and parents if they can;t work from home. Makes no sense to me.. back in Nov I was able to wal into a testing center with no appointment or symptoms and get a test (place was empty) has all this changed now?"
Problem is that the false positive rate for PCR is that well understood either... preliminary estimates show it could be somewhere between 0·8% and 4·0%.
Is this a cost cutting exercise ? I expect the governemnt to be cutting back on things money is very tight.
They recon 1:1000 kids wil be false positive, if there 3 mil secondary schoolers then thats 3000 missing school for two week plus siblings and parents if they can;t work from home. Makes no sense to me.. back in Nov I was able to wal into a testing center with no appointment or symptoms and get a test (place was empty) has all this changed now?