Clinical Diagnosis: How Doctors Use Signs, Symptoms, and Tests

A clinical diagnosis is the process by which a physician identifies a disease or condition based on:

1. History: Patient's reported symptoms, onset, duration, severity, and relevant medical/family/social history.
2. Physical Examination: Objective signs observed via inspection, palpation, percussion, and auscultation.
3. Diagnostic Testing: Laboratory tests (blood, urine, cultures), imaging (X-ray, CT, MRI, ultrasound), and specialized studies (ECG, biopsy, endoscopy) to confirm or refine the diagnosis.

This integrative approach distinguishes clinical diagnosis from purely laboratory-based or imaging-based diagnosis. The clinician synthesizes all data to form a working diagnosis, often using differential diagnosis to rule out alternatives.