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FYI
'That said, the Food and Drug Administration has extended the expiration dates for certain brands of tests. You can check a test by finding the lot number (typically found right by the expiration date) and cross-referencing it at this F.D.A. website.'
https://www.nytimes.com/2023/08/29/well/live/covid-test-expiration.html
@Birk_lab That's a good question, and I doubt there is a definite answer, given the concomitant variation in tests and viral types
@cyrilpedia do the antigen tests pick it up anymore in the first place? Virus changed so much from the initial one, have they ever been updated?