[orra]

Here is an example test which checks specifically for virus induced antibodies: <https://monitormyhealth.org.uk/covid19-antibody-test/>. Non-profit Testing for All also used to sell similar tests, but they have stopped operating.

In contrast this test does not distinguish between virus and vaccine as the cause: <https://onlinedoctor.superdrug.com/coronavirus-antibody-test...>.

I don't have a better approach than checking the descriptions of individual antibody tests. But I know the distinction is real, because IIRC the ONS (statistics body) used tests which distinguished, when they ran their ongoing study.