Clinical meaning
the clinician performs comprehensive health assessments integrating advanced history-taking, physical examination, and diagnostic reasoning to formulate differential diagnoses and management plans. The systematic approach begins with the chief complaint and history of present illness (using OLDCARTS: Onset, Location, Duration, Character, Aggravating factors, Relieving factors, Timing, Severity), progresses through a complete review of systems, and incorporates past medical history, family history, social determinants of health, and medication reconciliation. The clinician applies Bayesian reasoning to diagnostic decision-making: pre-test probability (based on prevalence, risk factors, and clinical presentation) is modified by test characteristics (sensitivity, specificity, likelihood ratios) to determine post-test probability. Understanding positive and negative predictive values in the context of disease prevalence prevents both overdiagnosis and missed diagnoses. Evidence-based screening follows Canadian Task Force on Preventive Health Care (CTFPHC) recommendations, applying principles of screening test validity, lead-time bias, length-time bias, and overdiagnosis to shared decision-making with patients.