Originally Posted by Mike Jacoubowsky

"Rapid" and "PCR" are not exactly mutually exclusive, but largely so. "Rapid" almost always refers to the antigen test, which is losing favor and not what I'd recommend for "insurance" against a new entry requirement added without your knowledge.

There is a version of PCR that is pretty fast, but it is assuredly not the norm. The typical PCR test takes 24 hours to get results back. The antigen test just 15-60 minutes. The home tests that you buy, including the Binax Now, are antigen and even the monitored one will not qualify for entry into any country that has changed to requiring a PCR test. To the best of my knowledge there is no remote (do it yourself with monitoring) PCR test available.

The antigen test is adequate for entry back into the US, but that could change if the US administration decides to endorse a relatively-safe universal standard for the US and EU that would require both vaccinations and a negative PCR test. Europe is definitely heading away from the antigen test being considered adequate.