Update - I just came from a meeting regarding if the vaccine should be given to immune suppressed patients. The concern is that the suppression will prevent the body from building immunity. One of the points brought up is that the because the mRNA vaccines work different the antibodies they create are different than the antibodies you would get from having the virus - therefore the current antibody tests cannot pickup the vaccine antibodies.Unlike a flu vaccine, there is no form of virus in the Pfizer/Moderna vaccines. There’s nothing in them to cause a false positives in a test looking for the virus. It’s possible someone was trying to use an antibody test to detect active infections (a theory that was determined did not work early on). So it’s possible someone is using the wrong test and misinterpreting the outcome but that *should* be unlikely.
The best standard for rapid tests right now are molecular PCR.
So I personally don’t see any way for the vaccine to cause a false positive.
Sending the test off for 3 days sounds like a non-rapid PCR test, probably Quest or Labcorp’s test. How is she doing?