Diagnosis is the medical process of identifying a disease, condition, or injury based on symptoms, examination, test results, and clinical judgment. Healthcare providers gather information through patient history (reported symptoms, medical background), physical examination, and diagnostic tests (blood work, imaging, biopsies) to determine what is causing health problems. Accurate diagnosis is essential because treatment depends on correctly identifying the condition. In Canada's healthcare system, family physicians often make initial diagnoses, referring patients to specialists for complex or serious conditions. Diagnostic services including laboratory tests and medical imaging are covered by provincial health insurance when ordered by physicians. Wait times for diagnostic services vary by province and test type, with concerns about delays affecting patient outcomes. Access to timely diagnosis is a key healthcare quality measure.