Mary Jane may not be able to ride

[Alex K]

Does the test have 8% false positive? For a rare condition such a false positive rate makes a test entirely useless to show a person is positive. If say one out of 10 tested people is on average expected to be positive, a test with an 8% false positive rate means a positive result is as likely due to false alarm as it is a true positive result. So it really hinges on prior probability whether such a test is of any use to show a person is positive. Excluding the condition can still be more reliable which can have its uses, but the person using the test must be aware that this only goes one way...