forced expiratory volume

volume /vol·ume/ (vol´ūm) the measure of the quantity or capacity of a substance. Symbol V or V.

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end-diastolic volume  (EDV) the volume of blood in each ventricle at the end of diastole, usually about 120–130 mL but sometimes reaching 200–250 mL in the normal heart.

end-systolic volume  (ESV) the volume of blood remaining in each ventricle at the end of systole, usually about 50–60 mL but sometimes as little as10–30 mL in the normal heart.

expiratory reserve volume  the maximal amount of gas that can be exhaled from the resting end-expiratory level. Abbreviated ERV.

forced expiratory volume  the fraction of the forced vital capacity that is exhaled in a specific number of seconds. Abbreviated FEV with a subscript indicating how many seconds the measurement lasted.

inspiratory reserve volume  the maximal amount of gas that can be inhaled from the end-inspiratory position.

mean corpuscular volume  the average volume of erythrocytes, conventionally expressed in cubic micrometers or femtoliters per red cell.

minute volume  (MV) the quantity of gas exhaled from the lungs per minute; tidal volume multiplied by respiratory rate.

packed-cell volume  (PCV), volume of packed red cells (VPRC) hematocrit.

residual volume  the amount of gas remaining in the lung at the end of a maximal exhalation.

stroke volume  the volume of blood ejected from a ventricle at each beat of the heart, equal to the difference between the end-diastolic volume and the end-systolic volume.

tidal volume  the volume of gas inhaled and exhaled during one respiratory cycle.

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forced expiratory volume

n. Abbr. FEV

The maximum volume of air that can be expired from the lungs in a specific time interval when starting from maximum inspiration.

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Forced expiratory volume (FEV1)

The maximum amount of air expired in one second.

Mentioned in: Chronic Obstructive Lung Disease

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forced expiratory volume (FEV),

the volume of air that can be forcibly expelled in a fixed period after full inspiration. Compare vital capacity. See also expiratory reserve volume.

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forced expiratory volume (FEV),

n the volume of air that can be forcibly expelled in a fixed time after full inspiration.

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forced expiratory volume

FEV Pulmonary medicine The maximal amount of air that can be exhaled in a period of time, usually 1–FEV₁, or less commonly, 3–FEV₃ seconds; FEV₁ is usually reduced–and thus is a major parameter measured in obstructive airways disease, a generic term that encompasses asthma and COPD. See Pulmonary function test.