Antibody tests used to determine if people have been infected in the past with Covid-19 might be wrong up to half the time, the US Centers for Disease Control and Prevention says in new guidance
Antibody tests, often called serologic tests, look for evidence of an immune response to infection."Antibodies in some persons can be detected within the first week of illness onset," the CDC says.They are not accurate enough to use to make important policy decisions, the CDC said.
Therefore, its best to use tests with high specificity -- which are unlikely to throw up a lot of false positives -- and in populations where doctors suspect there are many cases," the CDC said.The Food and Drug Administration has also cautioned about the accuracy of antibody tests.
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