Here's a link to an antibody test done on capillary blood, such as a finger prick:https://www.biomedomics.com/products/infectious-disease/covid-19-rt/
The test is meant to identify people who have previously had COVID19 infection, and the company website reports that both the sensitivity and specificity are about 97%. This sounds great, but in a setting where only a small percent of people have actually had COVID19, a positive test will often be misleading. For example, if only 2% of the population being tested has been infected, a positive test will be wrong about 60% of the time. Even using the current CDC revised estimate of 6% having been infected, a psoitive test will still be wrong 33% of the time.
Got it. Thank you very much!