A medical test is an objective diagnostic procedure designed to assess physiological function, identify biochemical imbalances, or detect the presence of pathogens and structural abnormalities within the human body. These tests encompass a vast range of methodologies, including laboratory analyses of bodily fluids, imaging techniques that visualize internal structures, and functional assessments that measure organ performance. The purpose of testing is to gather quantifiable data that aids clinicians in establishing a differential diagnosis, monitoring the progression of chronic conditions, or determining the efficacy of therapeutic interventions. The interpretation of test results requires careful consideration of the patient's full clinical history and physical examination, as no single diagnostic result is definitive on its own.