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Spirometry
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===Forced expiratory volume in 1 second (FEV1)=== FEV1 is the volume of air that can forcibly be blown out in first 1-second, after full inspiration.<ref name="Office"/> Average values for FEV1 in healthy people depend mainly on sex and age, according to the diagram. Values of between 80% and 120% of the average value are considered normal.<ref name=uppsala>LUNGFUNKTION β Practice compendium for semester 6. Department of Medical Sciences, Clinical Physiology, Academic Hospital, Uppsala, Sweden. Retrieved 2010.</ref> Predicted normal values for FEV1 can be calculated and depend on age, sex, height, mass and ethnicity as well as the research study that they are based on.
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