What are the tests available for Asthma? How can Asthma be diagnosed? Asthma is diagnosed based on the patient's medical history physical examination and laboratory test results. Your doctor will take a detailed medical history and ask you about your asthma symptoms and allergy triggers. Your doctor may use one or more of the following asthma tests to diagnose asthma to assess your breathing and to monitor the effectiveness of asthma treatment: Blood and Sputum analysis show an increase in the number of eosinophils. The level of a certain antibodies can be elevated. Chest X-ray - may show abnormality in