HOUSTON – There is growing controversy over antibody testing and the potential immunity and a warning about fake tests. And we also aren’t sure about the reliability of many of the antibody tests currently being used,” said Dr. John Torres, NBC chief medical correspondent. Researchers in California found 15% of antibody tests they analyzed produced a false positive. The antibody tests could be valuable in the meantime. As of this week, there are 150 antibody tests on the market without having faced Government review.