My workspace immediately retests if you get a positive. While you wait.
The tests seem to have a high false-negative rate. Assuming independence and 25% FN rate, a second test will miss an additional 20% of infections of all people tested.
I think that the antibody tests are sketchy in the first place, but if they don't even stick to the protocol and don't follow up positive antibody tests with PCR tests, it's almost pointless.