RE: Sensitivity not important? But rather specificity is KEY!23 Jun 2020 15:31
Matt5521, could you provide the link that specifies MHRA guidelines for a POC antigen test, that you have quoted.
I believe sensitivity is key for a test to determine if you have the active virus. The purpose of the test is to identify the people who have the active virus so that they can be stopped from infecting others, this purpose is best served by having the highest sensitivity possible. To use your example, a test with ridiculous 0% sensitivity will mean that everyone will test negative, so what is the point of the test? A sensitivity of 80% means that 1 in 5 people walk away believing they do not have the virus (a false negative), so go about their business spreading the virus, believing they are clear. 90% sensitivity means the number of false negatives is 1 in 10. In essence, both sensitivity and specificity need to be as high as possible but if the aim is to indentify and control the spread of the virus, sensitivity is most important.