This is a letter from the NJ Department of Health about antibody testing. There are many caveats about the tests. This letter will point out several of them. I highlighted what I thought was critical.
It truthfully discusses where we are. Unfortunately it leaves us with many questions because there is much we don't know. The bottom line is, even if you test positive for the antibody, we do not know if you are immune. The same is true if you have had COVID19. We just don't know.
Nothing is easy about this virus.