Clinical pathology links laboratory science to bedside decision-making by interpreting biochemical, hematologic, and microbiologic test results. This book presents core lab principles, quality-control practices, and the clinical relevance of common assays. It provides practical guidance on specimen handling, test selection, and result interpretation across major disease domains. Algorithmic approaches and quick-reference tables support differential diagnoses and monitoring strategies. Targeted case examples illustrate how the lab drives diagnosis, prognosis, and therapeutic monitoring.