Asthma diagnosis is based on clinical presentation of symptoms of reversible airflow obstruction and
physical examination to rule out other conditions.
• Diagnosis should be confirmed with lung function tests. Spirometry before and after bronchodilator
inhalation is the preferred objective measure for assessing lung function. Peak flow meters can be used
as an alternative when spirometry is not available.
• Assess for triggers; e.g., cigarette smoke, viral infections, gastroesophageal reflux, odors, allergens.