Bloodwork is performed to check what we can’t on a physical exam. Anesthetic agents are metabolized through the liver and kidneys. Basic blood profiles for young healthy patients include: liver and kidney function, hydration status and a complete blood count (CBC). Comprehensive blood profiles are done for middle-aged to older patients or if your pet is ill. These include complete liver, kidney and pancreatic panels, as well as thyroid, electrolytes, hydration status and a complete blood count (CBC).