ClinIQ Lexicon · Abbreviation
FEV1 — Forced Expiratory Volume in 1 Second
What FEV1 means
FEV1 is the volume of air a person can forcefully exhale during the first second of a forced breath. It is measured with spirometry and expressed in liters or as a percentage of the predicted value for a person’s age, height, and sex. Low FEV1 values point toward obstructive airway disease.
FEV1 in clinical practice
In asthma care, FEV1 anchors both diagnosis and follow-up: spirometry showing reduced FEV1 with significant improvement after a bronchodilator supports reversible airflow obstruction. The ClinIQ pulmonology article on asthma walks through how FEV1 thresholds drive severity staging and treatment-step decisions.
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