Not only does it not save you in any way, it in fact opens you up for further damaging litigation as you have to justify why you ordered the unnecessary tests. In trying to justify why you ordered an unnecessary test, the prosecution can damage your credibility as a competent physician by pointing out you didn't know what you were doing and were just randomly ordering tests to cover your ass.
By definition, a test is unnecessary if it does not contribute to the diagnosis or treatment of a patient. You cannot be saved by getting an unnecessary test. You can get screwed by ordering an unnecessary test.
As I always say, don't believe me... just look at the mountain of studies done by thousands of people over decades (from lawyers, to physicians, to psychologists, etc, etc.). Every detail and piece of data about who, what, where, why and when doctors get sued has been examined ad nauseum.
Please prove me 100% wrong.
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--Some of us look for The Way in opium and some in God, some of us in whiskey and some in love. It is all the same Way and it leads nowhither.