JSAL Anesthesia Practice Test 2026 – Comprehensive Exam Prep

SpO2 reflects how much oxygen the hemoglobin in the blood is carrying. In healthy dogs under anesthesia, oxygenation should be near full saturation. A normal, reliable range is about 97 to 100 percent. Readings at 101 percent aren’t physiologically possible, though minor overread can occur with some monitors. Lower ranges such as 92–96 or 88–92 indicate hypoxemia or poorer oxygenation and would signal a need to check ventilation, oxygen delivery, or airway patency. So the 97–100% range best represents normal SpO2 in anesthetized dogs.