I believe repeating the test is standard procedure for many tests - if the first one is positive. However the repetitions are usually temporally separated (in s

I believe repeating the test is standard procedure for many tests - if the first one is positive. However the repetitions are usually temporally separated (in some cases intentionally, in others because the test takes time.) This is effective in those cases because although there are a lot of temporary causes for a false positive to spike, there are fewer where it's persistent.