Which spirometry pattern characterizes restrictive lung disease?

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Prepare for the American Board of Family Medicine Examination. Test your knowledge with flashcards and multiple choice questions, each with explanations and hints. Ready yourself for success!

Multiple Choice

Which spirometry pattern characterizes restrictive lung disease?

Explanation:
Restrictive lung disease limits how much the lungs can expand, so total lung capacity (TLC) is reduced. On spirometry, FEV1 and FVC decline, but they do so proportionally, leaving the FEV1/FVC ratio normal or even increased. This combination—reduced TLC with a preserved FEV1/FVC ratio—best characterizes restrictive disease. Obstructive patterns show a reduced ratio, and an increased DLCO is not typical for restrictive disease.

Restrictive lung disease limits how much the lungs can expand, so total lung capacity (TLC) is reduced. On spirometry, FEV1 and FVC decline, but they do so proportionally, leaving the FEV1/FVC ratio normal or even increased. This combination—reduced TLC with a preserved FEV1/FVC ratio—best characterizes restrictive disease. Obstructive patterns show a reduced ratio, and an increased DLCO is not typical for restrictive disease.

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