Spirometer

Spirometer

A spirometer is a medical instrument used to measure the volume of air inhaled and exhaled by the lungs. It is a critical tool in conducting pulmonary function tests which are essential for diagnosing and managing respiratory conditions. By measuring breath strength and lung capacity, a spirometer provides valuable information about the functioning of the lungs.

A patient taking a spirometry test.

Overview of Spirometry

Spirometry is a common office test used to assess how well your lungs work by measuring how much air you inhale, how much you exhale and how quickly you exhale. Spirometry is used to diagnose asthma, chronic obstructive pulmonary disease (COPD) and other conditions that affect breathing.

Purpose of Spirometry

Spirometry can be used to help diagnose a lung condition if you have symptoms of a problem, or your doctor feels you are at an increased risk of developing a particular lung condition.

The Spirometer Device

A spirometer is composed of a mouthpiece attached to a machine that records the data. Modern spirometers are often digital and can provide immediate feedback through a connected monitor.

Types of Spirometers

• Incentive Spirometer: Used for encouraging deep breathing in patients with compromised lung function.
• Handheld Spirometer: Portable devices used for basic pulmonary function tests.
• Computerized Spirometers: Provide detailed measurements and can be integrated into electronic health records.

A handheld spirometer used for lung function testing.

Spirometry Procedure

During a spirometry test, you are asked to breathe into a mouthpiece that is connected to the spirometer. The test usually requires you to breathe in and out as deeply and as quickly as you can.

Steps of the Procedure

1. The patient is seated and a clip is placed on the nose to ensure that all breath goes through the mouthpiece.
2. The patient takes in a deep breath and then exhales as quickly and forcefully as possible into the spirometer.
3. The procedure may be repeated several times to ensure consistency in the readings.

Spirometry Measurements

Spirometry tests can record a variety of measurements, two of which are most commonly reported:

• Forced Vital Capacity (FVC): The total volume of air that can be forcibly exhaled after taking the deepest breath possible.
• Forced Expiratory Volume in 1 second (FEV1): The volume of air that can be forcibly blown out in one second, after full inspiration.

A chart displaying Forced Vital Capacity (FVC) results.

Clinical Relevance of Spirometry

Spirometry is pivotal in diagnosing and managing diseases such as:

• Asthma
• Chronic Obstructive Pulmonary Disease (COPD)
• Cystic Fibrosis
• Interstitial Lung Disease

Spirometry in Pulmonary Rehabilitation

Patients with chronic lung diseases may undergo pulmonary rehabilitation where spirometry readings help tailor respiratory therapies and monitor progress.

See Also

• Pulmonology
• Respiratory Therapy
• Breathing Exercises
• Lung Function Test

External Links

• American Lung Association - Spirometry
• ATS Patient Information Series - Spirometry

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