Lung Function Testing

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Family Allergy & Asthma Care of Montana uses lung function testing to diagnosis and access cases of mild to severe asthma. By evaluating the patient’s lung test, we can gain information about the severity of the asthma and better treat patients needing respiratory care.


Spirometry is the most common lung function test to assist in the diagnosis of asthma. Spirometry is a simple but important breathing test that can be performed by adults and most children over 6 years old. The test is performed by measuring how much air you inhale and exhale, and the speed of your exhale. Patients will blow on a tube connected to a spirometer.

The results from this lung function test can assist in the diagnosis of asthma, especially when the test is done before and after using a rescue medication like albuterol.

Pulse oximetry

This non-invasive test measures the oxygen saturation of a patient’s blood. A small sensor is placed on the fingertip for a few seconds. The sensor reads the oxygen levels in a patient’s blood and will determine if the patient is in need of supplemental oxygen, especially when suffering from asthma or other respiratory disorders.