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ModerateRespiratory MedicineCOPD Long‑Term Oxygen Therapyus-abfmus-abimus-usmle-step-2us-usmle-step-3

A 68-year-old with stable COPD has resting arterial blood gas on room air showing PaO₂ 54 mm Hg and SaO₂ 87%. What is indicated?

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