An added benefit on asthma diagnosis could be offered by oscillometry. Oscillometry measures the total breathing resistance by using the oscillometer connected to the patients’ mouth and a source that creates wind waves with a short volume. Using this method, the wind pressure and the travel of the wind in the mouth are recorded at the same time. The airflow oscillations that are produced artificially from a megaphone in frequencies from 2 to 30 Hz, overlay the normal oscillation in levels of normal breathing volume. This test requires little cooperation from the patient since it is performed with the patient breathing normally.
This makes the test ideal for patients that find it hard to cooperate for a spirometry test such as the elderly and children. The results can replace, complement or compared with the results of spirometry. The convience of performance of oscillometry makes it a good alternative for the investigation of reversibility or the presence of bronchial hyper-reactivity for all patients older than 2 years old. Therefore, it offers a measurable parameter for the control and appraisal of childhood asthma.