Why Is the Exhaled Fraction of NO (F_ENO) Useful in the Diagnosis

question 33

Multiple Choice

Why is the exhaled fraction of NO (F_ENO) useful in the diagnosis and management of asthma?

• A) It is a chemical mediator exclusive to lymphocytes and helps diagnosis asthma.
• B) Its concentration increasing in the presence of airway inflammation.
• C) It helps identify the lymphophilic asthma phenotype.
• D) Can easily be measured with a standard end-tidal CO₂ detector.

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