> test multiple times to rule out false positives Would that do any good though? Are failures correlated in the case of the Alzheimer's test? What causes the t

> test multiple times to rule out false positives Would that do any good though? Are failures correlated in the case of the Alzheimer's test? What causes the test to fail? If it's truly random, then yes, you can retry; but that presupposes that trials are independent of each other; and I'm be surprised if that were in fact the case.