GVS Lung Function Test Filters
Pulmonary function tests are used to measure breathing and how well the lungs are functioning. The main tests carried out are Spirometry, Diffusion and Body Plethysmography.
Spirometry is the most common of the lung function tests, measuring lung function, in particular the amount (volume) and/or speed (flow) of air that can be inhaled and exhaled. Spirometry is an important tool used to assess conditions such as asthma, pulmonary fibrosis, cystic fibrosis, and COPD (Chronic Obstructive Pulmonary Disease). The spirometry test is performed using an instrument called a spirometer. During spirometry test, the patient places their mouth over a mouthpiece connected to the spirometer, takes a deep breath in and then blows out as forcefully as possible.
Lung Diffusion Test
It assesses how well oxygen passes from the lung’s air sacs (alveoli) into the blood stream. This test measures the diffusing capacity of the lungs for carbon monoxide. During the test the patient is sitting down, a mouthpiece is fit tightly around the mouth and a nose clip positioned to prevent breathing via the nose during the test. The patient then inhales a small amount of carbon monoxide gas, holds the breath for 10 seconds and then exhales as fast as possible. The exhaled gas is then analysed to determine how much carbon monoxide the body absorbed during the breath.
Peak Flow Test
The peak flow test (peak expiratory flow test or PEF) is a lung function test to measure how fast a person can breathe out. The peak flow test is performed using a device peak flow meter. During the test the patient takes a full breath in, then blows out as fast as possible into the flow meter, the measurement taken is the peak flow.
Different pulmonary function tests measurements include:
VC - Vital Capacity The volume of air exhaled from the lungs after a full inhalation
FVC - Forced Vital Capacity The volume of air forcibly exhaled from the lungs after taking the deepest breath possible
RV - Residual Volume The volume of air remaining in the lungs after exhalation
TLC - Total Lung Capacity The maximum volume of air that the lungs can hold
FEV1 - Forced Expiratory Volume in One Second The volume of air which can be forcibly exhaled from the lungs in the first second of a forced exhalation
FEV1/FVC-FEV1 - Percent (FEV1%) The ratio of FEV1 to FVC tells the clinician what percentage of the total amount of air is exhaled from the lungs during the first second of forced exhalation
PEFR - Peak Expiratory Flow Rate Measures if treatment is effective in improving airway diseases such as COPD
FEF - Forced Expiratory Flow Measures exhaled volume of air to indicate if a large airway obstruction is present
MVV - Maximum Voluntary Ventilation A value determined by having the patient inhale and exhale as rapidly and fully as possible in 12 seconds. The results reflect the status of the muscles used for breathing, how stiff the lungs are and if there is any resistan- ce in the airways. Indicating how strong a patient's lungs are prior to surgery. Poor performance suggests that respiratory complications may occur after surgery