Disease diagnosis of livestock as well as pet animals is a major aspect of health and production assessment. Veterinary clinicians treat disease and disorder of animals, which includes diagnosis, treatment and aftercare. So, it is crucial for a clinician to properly diagnose a disease condition for optimum management and control of diseases. To aid their knowledge of disease diagnosis; different clinical laboratory diagnostic tests and pathological techniques vis-à-vis interpretation thereof would be of great help. This book will help the clinician to refresh their knowledge of utilization of clinico-pathological techniques and their interpretation for animal disease diagnosis and their management.