Definitions for "DIFFERENTIAL DIAGNOSIS"
the professional clinical evaluation of possible causes of an illness.
The distinguishing of a disease or condition from among others that present with similar symptoms
Distinguishing between two or more diseases and conditions with similar symptoms by systematically comparing and contrasting their clinical findings, including physical signs, symptoms, as well as the results of laboratory tests and other appropriate diagnostic procedures.
DSMIV How to differentiate one disorder from others that have some similar presenting characteristics.