What is the term for differentiating between two or more conditions that share similar signs or symptoms?

• A. Diagnosis
• B. Differential prognosis
• C. Syndrome differentiation
• D. Differential diagnosis

Answer: (D)

Differential diagnosis is the process of distinguishing between two or more conditions that have similar signs or symptoms. In practice, clinicians compare the possible disorders, gather relevant history, perform a careful exam, and use assessment criteria to determine which condition best explains the presentation while ruling out others. This approach guides treatment decisions and informs prognosis. It differs from a final diagnosis, which is the specific label established after evaluation; prognosis concerns the likely course and outcome, not the act of separating competing explanations. Terms like differential prognosis or syndrome differentiation aren’t the standard way to describe this analytic process.