By the end of this lesson, the learner should be able to: - Explain how interstitial inflammation and fibrosis cause reduced compliance, restrictive physiology, diffusion impairment, and hypoxemia. - Recognize early, progressive, and late ILD manifestations. - Interpret PFT, HRCT, ABG, pulse oximetry, six-minute walk, bronchoscopy, and biopsy findings at exam scope. - Differentiate ILD from COPD, asthma, heart failure, pneumonia, and pulmonary fibrosis terminology traps. - Prioritize oxygenation, activity tolerance, pulmonary hypertension/cor pulmonale monitoring, and respiratory failure escalation. - Teach oxygen safety, pulmonary rehabilitation, energy conservation, smoking cessation, vaccination, follow-up, and when to seek care. On the exam, writers often pair stable-sounding options with unstable data—notice the mismatch before you commit. If the stem names a license or role, reread that line; scope errors are classic trap answers even when the clinical topic is familiar. Run a 60-second scan: breathing work and oxygenation, perfusion and end organs, neuro baseline, likely infection sources, and devices that can fail quietly. When two answers feel partly right, pick the one that reduces imminent harm and matches orders for the role you were...