A biochemist on the texags site indicated a while back that his firm is working on all aspects of COVID. He said he wouldnt trust the antibody tests right now (at that time) and his company wouldnt release one until they were confident.
I do know there are issues with antibody tests.
I do know there are trying to figure out how long the antibody stays with you. It could be a short time in some cases.
If you had all the symptoms and are convinced you had it in January but you get tested and have no antibodies...dont assume you didnt have Covid.
That said, there are no clear cut answers on this testing
I do think before Jimmie Johnson was cut from the Nascar race they should have done tests 24 hours apart AND from different makers. He had tested that he had the antibodies at an earlier time
About a week after he couldnt race due to a positive test.. he tested negative twice
Something is off about his scenario.
Rand Paul had it and has been giving blood on a regular basis since he recovered for plasma purposes!!
Even when Fredo Coomo supposedly had it, he looked and sounded fine even though he said it was like the worst flu he ever had. Yeah, right.