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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.
For the purpose of diagnosing, monitoring, screening and prognosis, in vitro diagnostic tests are essential at every step. 1  Diagnosis is the process of finding out if a patient has a specific disease. 2  A medical professional prescribes a test to make a diagnosis or to exclude possible illness.