What is the target oxygen saturation for a COPD exacerbation?

Patients with chronic obstructive pulmonary disease rely on a hypoxic drive to breathe because their chemoreceptors have adapted to chronically elevated carbon dioxide levels. Targeting an oxygen saturation of 88–92% is the accepted standard for COPD exacerbations. This range provides adequate tissue oxygenation while avoiding the risk of hypercapnic respiratory failure that can occur if oxygen is administered too liberally. Delivering high-flow oxygen can eliminate the hypoxic stimulus, causing respiratory depression, carbon dioxide retention, and respiratory acidosis. A saturation of 100% or 95–100% would be dangerously high for a COPD patient because the resulting hyperoxygenation could suppress the hypoxic drive and lead to hypoventilation and worsening hypercapnia. A saturation of 75–80% is far too low and would indicate severe hypoxemia requiring immediate intervention. The British Thoracic Society and major respiratory guidelines universally endorse the 88–92% target in COPD exacerbations. In practice, controlled oxygen delivery via a Venturi mask allows precise titration to maintain this range. Nurses should monitor both pulse oximetry and clinical signs of respiratory distress to guide oxygen therapy adjustments throughout the exacerbation.