The complete blood count (CBC) is a much more sensitive indicator of disease than physical exam. White blood cells (WBCs) and platelets can change within hours due to acute infectious diseases. Abnormal glucose levels can increase anesthetic risk and differ markedly between fasted vs non-fasted, breeds, age & sick vs healthy patients. Evaluating electrolytes, hematocrit and total protein in fasted patients is essential for anesthesia monitoring, minimizing the risk of arrhythmias, hypotension, & facilitating patient recovery.