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diagnostic. adj. 1. (Medicine) of, relating to, or of value in diagnosis. 2. (Biology) of, relating to, or of value in diagnosis. n. 3. (Medicine) med any symptom that provides evidence for making a specific diagnosis. 4. (Medicine) a diagnosis. 5. (Biology) a diagnosis.
Restore Your Health. Functional Diagnostic Nutrition (FDN) is a type of detective work that seeks to identify the underlying causes of disease instead of treating symptoms.unctional Diagnostic Nutrition (FDN) is a type of detective work that seeks to identify the underlying causes of disease instead of treating symptoms.