Diagnostic criteria are specific guidelines used by healthcare professionals to identify and classify medical conditions or mental health disorders. These criteria help ensure that diagnoses are consistent and based on standardized symptoms, behaviors, or test results. They are often outlined in manuals such as the Diagnostic and Statistical Manual of Mental Disorders (DSM) or the International Classification of Diseases (ICD). By following these criteria, clinicians can make informed decisions about treatment and management. Accurate diagnoses are crucial for effective patient care, as they guide the selection of appropriate therapies and interventions tailored to individual needs.