You asked how could you have discrepant results between the two of you. I gave you a few scenarios for the situation. There are more, but since you seems to know far more about the ins and outs of serological viral antibody tests than I do, don't know why you bothered answering the question.
I'm sure your doctor is very good. If he administered the test it's very possible he, and many others, were deceived by the glut of poor performing antibody tests that came out in the first wave. Even if it was a good test, there are many conditions that people may have that confound these tests, but obviously you know this also.
I'm sure your doctor is very good. If he administered the test it's very possible he, and many others, were deceived by the glut of poor performing antibody tests that came out in the first wave. Even if it was a good test, there are many conditions that people may have that confound these tests, but obviously you know this also.