Fef1

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FEF1

FEF1 (pronounced as /fɛf wʌn/), also known as Forced Expiratory Flow at 80% of the pulmonary volume, is a key term in pulmonology and respiratory physiology.

Etymology

The term FEF1 is an acronym derived from the phrase Forced Expiratory Flow at 80% of the pulmonary volume. The term is used to describe a specific measurement in spirometry, a common 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.

Definition

FEF1 is a measure of the speed of exhalation. It is calculated as the average flow (or speed) of air coming out of the lung during the middle portion of the expiration. The FEF1 value is often used in conjunction with other measurements, such as Forced Expiratory Volume in 1 second and Forced Vital Capacity, to diagnose and monitor lung diseases.

Related Terms

  • Spirometry: A common type of pulmonary function test (PFT) that measures how much air a person can inhale and exhale, and how quickly they can do so.
  • FEV1: Forced Expiratory Volume in 1 second, a measure of how much air a person can forcefully exhale in one second.
  • FVC: Forced Vital Capacity, the total amount of air a person can forcefully exhale after taking the deepest breath possible.
  • Pulmonology: The medical specialty dealing with diseases involving the respiratory tract.
  • Respiratory Physiology: The branch of human physiology focused on the study of the respiratory system.

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