&quot;If you have 40 tests spanning 20 years saying that you aren&#x27;t at risk for Total Scrotal Implosion, and then suddenly, without any symptoms, you get a result saying your testicles will fall off tomorrow, you have context with which to interpret this result. Without the historic data there is much greater risk of you and your healthcare provider agreeing to an unnecessary knee-jerk scrotalectomy.&quot;<p>This would be true if the issue if the reason for a test&#x27;s error rate is due to inaccuracy of the result (e.g. I am trying to measure temperature, and 5% of the time it measures higher than it actually is) In that case, measuring often and keeping track of historical data would help.<p>However, this is NOT the major problem with these sorts of medical tests. The issue is that they are measuring something only RELATED to the disorder they are screening for, and not the disorder itself.<p>The actual fact is something more like: We have noticed that people that measure above value X on this test have higher rates of Total Scrotal Implosion.<p>However, there are lots of people who have above value X on the test who do NOT ever get Total Scrotal Implosion. You can test them every day, and the test accurately measures that they have higher than X of whatever is being tested - but they will never get TSI.<p>You can&#x27;t fix this with more tests and tracking historical data - the test is accurate for what it is measuring, so repeated tests aren&#x27;t going to change the overall accuracy of the PREDICTION that is being made from the test.