How often should stable patients with asthma undergo spirometry? — Robert Marsh, ARNP, Fordland, Mo.

According to a joint clinical practice guideline from the Department of Veterans Affairs and the Department of Defense, spirometry should be performed at least every one to two years on stable patients with persistent mild, moderate or severe asthma (more frequently if the asthma is not well controlled). Spirometry is appropriate for patients aged 5 years and older. — Sherril Sego, FNP-C, DNP


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