If a doctor is sued for malpractice, that means they made a mistake. If they are performing extra tests to avoid malpractice, that means they are performing extra tests to avoid making mistakes. That is a good thing.
No, it means that someone has a story about an adverse outcome that they think can be blamed on the doctor making a mistake; it doesn't mean either that the adverse outcome actually occurred or that it was caused by the doctor making a mistake.
That's why we have trials.