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It is easy for drivers to estimate how large the safety distance should be. There are rules of thumb like “half the speedometer in meters”. In medicine, it is more difficult to determine when patients are safe. This applies, for example, to the time interval between the next examination if the first one was unremarkable. For men over the age of 50 and for women over the age of 55, a colonoscopy is offered twice and is covered by health insurance companies. As a rule of thumb, if the result is negative after ten years, the next examination would make sense.
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