Have you had the one for COVID. It goes way deeper than any nasal swab I've ever had done. In fact, it was longer than the flu one they did right before.I've had the swab before...a bit uncomfortable but not what I would call invasive. A blood draw I would call invasive.
I believe that point already was made clear.With all due respect, whether it is or is not invasive is irrelevant to the legal issue, which is that the OP's wife's employer is not violating any laws or protected rights in requiring the test.
No, it's not an antibody test.