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FEV1 (Forced Expiratory Volume in 1 second) is measured by spirometry. It plays an important role in chronic obstructive pulmonary disease (COPD).It measures the volume of air, in litres, exhaled during the first second of a forceful exhalation.
The number used (FEV1) is a percent of the average expected of someone of your height, age, sex and race. It is expressed as a percent of predicted. Any number over 80% is considered normal
The testing is done in the doctor’s office using a machine called a spirometer. This handheld device measures your lung function and records the results which are also displayed on a graph. The doctor will ask you to take a deep breath and then blow out into the mouthpiece on the spirometer as hard and fast as you can. It will measure the total amount that were able to exhale which is the forced vital capacity (FVC) as well as how much was exhaled in the first second, which is the forced expiratory volume in 1 second (FEV1). Your FEV1 is also influenced by other factors including your age, sex, height, and ethnicity. The FEV1 is calculated as a percentage of the FVC (FEV1/FVC).
Just as that percentage was able to confirm a diagnosis of COPD, it will also let your doctor know how the disease is progressing.
COPD Progression | |||
STAGE I |
mild |
Often minimal shortness of breath with or without cough and/or sputum. Usually goes unrecognized that lung function is abnormal |
> 80% of predicted |
STAGE II |
moderate |
Often moderate or severe shortness of breath on exertion, with or without cough, sputum or dyspnea. Often the first stage at which medical attention is sought due to chronic respiratory symptoms or an exacerbation
|
50-80% of predicted |
STAGE III |
severe |
more severe shortness of breath, with or without cough, sputum or dyspnea – often with repeated exacerbations which usually impact quality of life, reduced exercise capacity, fatigue |
30-50% of predicted |
STAGE IV |
very severe |
appreciably impaired quality of life due to shortness of breath – possible exacerbations which may even be life threatening at times
|
Less than 30% of predicted |
How Spirometry Assists in COPD Treatment
Regular use of Spirometry for progression tracking is crucial when it comes to COPD treatment. Each stage comes with its own unique issues and understanding what stage your disease is at allows your doctor to recommend and prescribe the best possible treatment for your stage of disease.
While staging assists in the creation of standard treatments, your doctor will take your spirometer results into consideration along with other factors to create a treatment that is personalized to you. Factors such as other comorbidities that may affect your lung capacity further like cardiovascular disease will be a consideration, as will your physical condition when it comes to rehabilitation therapy such as exercise.
Your doctor will schedule regular tests and use the spirometer results to make adjustments to your treatment as needed. This not only includes medications and even recommendation for surgery in some cases, but also lifestyle changes and rehabilitation programs to help improve your symptoms, slow progression, and improve your quality of life.
Spirometry, along with assisting in staging and treatment recommendations, also lets your doctor periodically check whether or not your treatment is working. The results of your tests can tell the doctor whether your lung capacity is stable, improving, or decreasing so that adjustments to treatment can be made.
This simple, inexpensive, and non-invasive test can help a COPD patient through all the various stages of treatment.
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Email: service@oxygencare.cn Tel: 400 6677 247/075523733851
Lovego Service
Toll free: 400-6677-247
Tel:86-0755-23733851
Add: Building B, LC Hi-tech Park, Longhua District, Shenzhen, China
Tel:86-0755-23733851
Add: Building B, LC Hi-tech Park, Longhua District, Shenzhen, China
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