Which diagnostic gas is used to evaluate for asthma?

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Multiple Choice

Which diagnostic gas is used to evaluate for asthma?

Explanation:
Measuring exhaled nitric oxide reflects the eosinophilic airway inflammation that is characteristic of asthma. This noninvasive test, FeNO, rises when allergic airway inflammation is active and decreases with effective inhaled corticosteroid therapy, making it a useful tool to diagnose asthma and to guide treatment decisions. Other gases like CO2 and O2 relate to ventilation and oxygenation rather than airway inflammation, and helium is not used routinely to diagnose asthma.

Measuring exhaled nitric oxide reflects the eosinophilic airway inflammation that is characteristic of asthma. This noninvasive test, FeNO, rises when allergic airway inflammation is active and decreases with effective inhaled corticosteroid therapy, making it a useful tool to diagnose asthma and to guide treatment decisions. Other gases like CO2 and O2 relate to ventilation and oxygenation rather than airway inflammation, and helium is not used routinely to diagnose asthma.

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