There are multiple factors involved in making something suitable for screening.
It includes that others have said.
Another factor not mentioned yet is cost-effectiveness. For the number of test you do, how many of the target disease will be picked up, and then how many years of life saved/disability avoided. So if you are thinking about looking for colon cancer you should target the age range that is affected most (and probably a bit beyond that age range at either end of it). There’s no point in doing the screening test in a group that isn’t affected; in the colon cancer example you wouldn’t do it on children as they don’t get colon cancer (for clarity there are exceptionally rare cases, most of which wouldn’t be picked up by the stool test used in my country to indicate who needs a colonoscopy)
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