An overview of Spirometry
Spirometry is a common office test used to assess lung function by measuring the amount of air inhaled, exhaled, and the speed of exhalation. It is used to diagnose and monitor conditions such as asthma, COPD, chronic bronchitis, emphysema, and pulmonary fibrosis. The test involves taking a deep breath and exhaling forcefully into a tube, with a clip placed on the nose to ensure proper airflow. The test is generally safe, but may cause temporary shortness of breath or dizziness. It is important to follow the doctor's instructions regarding medication use and dress comfortably for the test.
What is Spirometry used for?
Spirometry is a common office test used to assess lung function by measuring the amount of air inhaled, exhaled, and the speed of exhalation. It is used to diagnose conditions such as asthma, COPD, chronic bronchitis, emphysema, and pulmonary fibrosis. Spirometry may also be used periodically to monitor the effectiveness of treatments for chronic lung conditions and to screen for occupational-related lung disorders.
How to prepare for Spirometry?
Patient preparations for a spirometry test include:
- Following the doctor's instructions regarding the use of inhaled breathing medications or other medications before the test.
- Wearing loose clothing that allows for deep breaths.
- Avoiding eating a large meal before the test to facilitate breathing.
- Being seated during the test, with a clip placed on the nose to keep the nostrils closed.
- Taking a deep breath and exhaling forcefully into the tube for several seconds to obtain accurate results.
How is Spirometry conducted?
A spirometry test is conducted by measuring the amount of air inhaled and exhaled by the patient, as well as the speed of exhalation. The patient is seated during the test, and a clip is placed on their nose to keep the nostrils closed. They are then instructed to take a deep breath and exhale forcefully into a tube connected to a spirometer machine. The test is usually performed at least three times to ensure consistent results.
How are Spirometry results reported?
Spirometry results are typically reported in terms of the volume of air exhaled and the speed of exhalation. These measurements are used to determine lung function and capacity. The results may be compared to established norms or standards to identify any abnormalities or deviations from typical lung function. The test may also be repeated after administering a bronchodilator to assess its effect on airflow. The final result is usually the highest value among three close test results. The results are shared with the healthcare provider for interpretation and discussion with the patient.
Understanding the report
Spirometry results are interpreted by evaluating key measurements, such as forced vital capacity (FVC) and forced expiratory volume (FEV). FVC measures the largest amount of air forcefully exhaled after a deep breath, while FEV measures the amount of air forcefully exhaled in one second. These measurements help the doctor assess the severity of breathing problems and determine lung function. Lower FVC and FEV readings indicate restricted breathing and significant obstruction, which may indicate asthma, COPD, or other lung conditions. The doctor compares the results with standard reference values to identify abnormalities or the need for further evaluation.