What is considered a normal oxygen saturation range for a patient with COPD?

• A. 85-89%
• B. 88-92%
• C. 92-96%
• D. 95-99%

Answer: (B)

Oxygen therapy in COPD is about balancing oxygenation with the risk of CO2 retention. Many people with COPD have chronic high CO2 levels, so giving too much oxygen can suppress the drive to breathe and worsen CO2 buildup, leading to acidosis. Because of this, the target saturation is a narrow window that keeps tissues adequately oxygenated but avoids pushing the oxygen level high enough to impair respiration. The accepted target is around the mid to low 90s, which provides enough oxygen for organs without significantly increasing CO2 retention. If the saturation falls below this range, hypoxemia risks rise and oxygen should be adjusted. If it rises above this range, particularly in chronic CO2 retainers, the risk of hypercapnia increases. In contrast, healthy individuals normally sit at higher saturations, but COPD management prioritizes this careful balance.