Identification of a disease or disorder. Diagnosis requires a medical history (including family history), a physical examination, and usually tests and diagnostic procedures (e.g., blood analysis, diagnostic imaging). A list of possible causes—the differential diagnosis—is developed and then narrowed down by further tests that eliminate or support specific possibilities.

This entry comes from Encyclopædia Britannica Concise.
For the full entry on diagnosis, visit Britannica.com.

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