> If it says I do have something, then that means I should be on the lookout for other corroborating data or symptoms.
Unfortunately the power of suggestion is a very real thing, so this isn't nearly as rational as it appears at first glance. There's a reason the medical profession is seriously concerned about outside tests, and it's not just cartel behavior. It's probably the same mechanism as the Baader-Meinhof effect.
The medical profession can only treat a limited number of conditions. They work on a science based approach which requires costly experiments so the range is limited. Even when something is discovered changes can take a long time to filter to you. These type of tests offers insights not available to most through a doctor visit even if the accurancy is way off in some cases.
Unfortunately the power of suggestion is a very real thing, so this isn't nearly as rational as it appears at first glance. There's a reason the medical profession is seriously concerned about outside tests, and it's not just cartel behavior. It's probably the same mechanism as the Baader-Meinhof effect.