Thank you for your answer.
That is where I find different information.
For example
"Antibody tests are able to detect two different types of antibodies:
ānā antibodies (necleocapsid) which appear after an infection
āsā antibodies (spike antibodies) which appear after an infection or vaccination"
Or from the CDC website:
"Some antibody tests will only detect antibodies from infection, not from vaccination with the virus that causes COVID-19."
So it seems the antibody test should test for "nucleocapsid (N) protein"?
I have checked many websites and found many test centers / hospitals. Usually they don't show very detailed information. Also started sending them emails and asking my question.
Still confused ????