A home health nurse is assessing a client who has COPD. Which of the following findings indicates the need for a referral for pulmonary rehabilitation?

A. Clubbing of the fingers: Clubbing reflects long-term hypoxia and chronic lung disease progression, but it does not independently indicate the need for pulmonary rehabilitation. It is a structural change rather than a functional indicator of declining activity tolerance, so it does not guide referral decisions on its own. B. Pursed-lip breathing: Pursed-lip breathing is a compensatory technique commonly used by clients with COPD to improve expiration and reduce air trapping. Its presence shows the client is already using adaptive methods, but it does not signal a new decline or a need for pulmonary rehabilitation. C. Dyspnea at rest: Dyspnea at rest indicates significant functional impairment and poor exercise tolerance, which are key criteria for pulmonary rehabilitation referral. Pulmonary rehab helps clients who cannot maintain basic activity levels due to breathlessness by improving endurance, reducing dyspnea, and teaching energy-conservation strategies. D. SaO₂ 92%: An oxygen saturation of 92% is common and generally acceptable in clients with COPD, as their baseline values are often lower than normal. This finding does not independently suggest declining function or worsening symptoms that would warrant a referral for pulmonary rehabilitation.