Labcorp offers a SARS-CoV-2 Semi-Quantitative Total Antibody, Spike test. It is:

Labcorp 164090

This test will tell you if you made any or how many antibodies you currently have against the SARS-CoV-2 spike protein receptor binding domain from either a COVID vaccine and/or a previous SARS-CoV-2 infection.

If your doctor orders it, it will be free, but adults can also order it themselves (minors must have a doctor’s order) here:

https://patient.labcorp.com/v1/covid-19-antibody-test