Uses of the Spirometer

Spirometry is the measurement of the output capacity of the lungs. The patient takes a deep breath, blows out as hard as he can into a mouthpiece and maintains that positive pressure for a predetermined length of time (up to 10 or 15 seconds). The mechanics of the lungs, as well as the gases that are expelled, can thus be measured. A spirometer is used for detection of certain pulmonary diseases as well as treatment and workplace evaluations.

Respiratory Disease

• Early detection of lung cancer and other chronic lung diseases, such as asbestosis, may be detected using a prescreen with spirometry. The patient's lung capacity is compared to baseline standards. If the patient has a reduced capacity or too much expired CO2, there may be cause for further testing.

COPD

• Chronic obstructive pulmonary disease (COPD) is the precursor to the diagnosis of asthma. Here, spirometry will show if there is an obstruction in the breathing process (such as swelling of the throat or inability of the lungs to absorb enough oxygen). This is another test where early detection can save the life of the patient.

Workplace Evaluations

• Employees who work in an environment that requires them to use a respirator, either a paper mask or full-face, require a spirometry evaluation to determine if they can safely use one. When a respirator is worn, it is more taxing on the cardiovascular system and can be dangerous if used by an employee with compromised lungs.

Keep the Lungs Clear After Surgery

• Another type of spirometer is called an incentive spirometer. This device is used to keep a patient's lungs free from fluid buildup postsurgery. When patients are placed on a respirator under anesthesia, they blow into this spirometer during recovery for a few days following the procedure.