"Cost" is not purely monetary. The cost of additional testing includes patient's time spent traveling too and from additional appointments, additional patient s

"Cost" is not purely monetary. The cost of additional testing includes patient's time spent traveling too and from additional appointments, additional patient stress waiting for results, additional infections or other side effects from the tests themselves. There are very few things that have zero risk. If you run something on a large enough population someone will have an adverse reaction. The cost benefit trade off for additional testing isn't just about dollars spent performing the tests. Its about how many thousands of hours of people's lives will be spent in pointless worry and how many additional people will be made sick or killed by testing Vs the additional people that could be saved by additional testing.