Originally Posted by
SusanDK
Our flight back to the U.S. departs on a Wednesday evening from FRA ca. 17:30 (following a morning departure from CPH). Are you suggesting that it would not be wise to go for our PCR test on Sunday since the test center closes at 17:00 so we might fall outside 72 hours, even though we meet the criteria of 3 days? I would rather not push the test to Monday because then we don't have results until Tuesday and that feels like it's pushing it. I know we could do the rapid test, but I also don't want a false positive which seems more likely with that one. We are flying LH from CPH-FRA and it's a UA departure from FRA to the U.S.
The antigen tests like Binax supposedly have ~100% specificity so should not produce a false positive. They do have variable sensitivity depending on viral load and whether you have symptoms, so could have false negatives, but that depends how you define a positive. PCR could make nearly any sample positive from someone who has ever crossed paths with the virus, depending on the cycle threshold. If you ask a tech running a test then they will have no idea about the cycle threshold. So I would always opt for the antigen test.