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FEV1: COPD Stages and What your Result Mean




Your FEV1 value is an important part of evaluating Chronic Obstructive Pulmonary Disease (COPD) and Monitoring progression of the condition. FEV is short for forced expiratory volume. FEV1 is the amount of air you can force from your lungs in one second.

It is measured during a spirometry test, also know as a Pulmonary function test, which involves forcefully breathing out into a mouthpiece connected to a Spirometer machine. A lower than normal FEV1 reading suggests that you may be experiencing a breathing obstruction.

Having trouble is a hallmark symptom of COPD. COPD causes less air flow into and out of a person's airways than normal, making breathing difficult.

Normal Range for FEV1

The normal values for FEV1 vary from person to person. They're based on standards for an average healthy person of your age, race, height, and gender. Each person has their own predicted FEV1` Value.

You can get your general idea of your predicted normal value with a spirometry calculator. The centers for disease control and prevention providers a calculator that lets you enter your specific details. If you know your FEV1 value already, you can enter it as well, and the calculator will tell you what percent of the predicted normal value your result is.

How is FEV1 used to stage COPD?

If you already received a COPD Diagnosis, your FEV1 score can help to determine which stage your COPD has reached. This is done by comparing your FEV1 score to the predicted value of those individuals similar to you with healthy lungs.
  • Mild              -  80%
  • Moderate      -  50%-70%
  • Sever            -  30%-49%
  • Very severe  -  Less than 30%
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