But can you use a rapid NAAT test? Our email states, "The test should be a Nucleic Acid Amplification Test (NAAT), rapid PCR test or lab-based PCR test." Is there a rapid and non-rapid NAAT test, or are all NAAT tests rapid? I honestly don't know the answer. But if the rapid NAAT doesn't work for the cruise then you probably can't use Walgreens and CVS because the PCR lab tests may not come back in time.