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What is the technical term for a condition that is diagnosed by ruling everything else out?

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Diagnosis of exclusion

A diagnosis of exclusion (per exclusionem) is a diagnosis of a medical condition reached by a process of elimination, which may be necessary if presence cannot be established with complete confidence from history, examination or testing. Such elimination of other reasonable possibilities is a major component in performing a differential diagnosis.

https://en.m.wikipedia.org/wiki/Diagnosis_of_exclusion

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