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Children are always going to find cunning ways to bunk off school, and the latest trick is to fake a positive Covid-19 lateral flow test (LFT) using soft drinks. [Videos of the trick have been...
Jan 5, 2022 · Under the new guidance, anyone in England who receives a positive lateral flow device (LFD) test result should report their result on gov.uk and must self-isolate immediately, but will not...
- 2 min
- What Are Lfds?
- How Accurate Are They and Why Do The Figures Keep Changing?
- How Good Are Lateral Flow Tests at Detecting Cases of Covid-19?
- What Is The Specificity of Lfds?
- What About False Positives?
Lateral flow tests, or lateral flow devices (LFDs), for Covid-19 are rapid tests that do not need to be processed by a laboratory. The tests work in a similar way to a pregnancy test, but measure different substances in the sample. We have previously written about lateral flow tests before. To do a lateral flow test, a sample is taken from the nose...
The accuracy of a test can be measured in two main ways: 1. how successful it is in correctly detecting people with a particular condition (how many “true positives” it detects, or how “sensitive” it is), 2. how successful it is in correctly detecting people without the condition (how many “true negatives” it detects, or the “specificity”). This is...
Estimates of how sensitive lateral flow tests are have varied. PHE evaluations at Porton Down using community samples, for example, successfully detected real Covid-19 infections 78-94% of the time when the samples were compared with corresponding PCR results. The number of correctly detected infections was higher than this for groups of samples th...
Initial information from PHE evaluations which were released in November, showed that lateral flow tests are 99.68% specific, which means they successfully identify people who are not infected 99.68% of the time. In March, the DHSC released their data from 7,546 participants which showed that LFDs had a specificity of 99.72%—and perhaps as high as ...
As the level of Covid-19 in the population being tested decreases, the chances ofa positive test result being false increases. Through reported leaks and calculations by prominent statisticians on social media, there have been concerns about very high numbers of false positives from lateral flow tests during times when there are lower rates of Covi...
COVID-19 rapid lateral flow tests show the result on the testing device. What your COVID-19 test results means Positive test result. If you get a positive result, it means it’s very likely you have COVID-19. Try to stay home and avoid contact with other people for: 3 days if you are under 18 years; 5 days if you are 18 or over
- The timing is right to implement a temporary change to testing. Rapid lateral flow tests are an important way of allowing people who don’t have COVID-19 symptoms to find out if they are infected.
- PCR tests are still essential for people with symptoms. We are not discouraging people who need them to get a PCR test. If you develop any of the main symptoms of COVID-19 (a high temperature, a new, continuous cough or you’ve lost your sense of smell or taste or they’ve changed) you should still get a PCR test immediately, rather than a rapid lateral flow test.
- There are some situations where a follow up PCR test is still required. People who have a positive rapid lateral flow test result should only have a follow-up PCR test if
- With COVID-19 at record levels, boosting testing capacity and using different types of test wisely is crucial. We continue to expand our testing capacity and urge anyone who needs to access either rapid lateral flow tests, or a PCR test, to keep checking GOV.UK regularly.
Jan 11, 2022 · From 11 January, most people with a positive lateral flow test do not need to take a confirmatory polymerase chain reaction (PCR) test to confirm they have COVID-19.
Mar 10, 2021 · New analysis of community testing data shows lateral flow tests to have a specificity of at least 99.9%; This means fewer than one false positive in every 1,000 lateral flow tests carried out
