Which of the following variables is used to determine the presence of obstruction in spirometry measurements? A) FEF_25%-75% B) FEV₁/FVC% C) PEF D) FEV₁

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FEV₁/FVC% is the variable used to determine the presence of obstruction in spirometry measurements. It is a ratio of forced expiratory volume in the first second (FEV1) to forced vital capacity (FVC) expressed as a percentage. A lower value is indicative of obstruction in the airways. The other variables listed, such as FEF_25%-75% and PEF, may also be measured during spirometry but are not as useful for determining obstruction.

Which of the Following Variables Is Used to Determine the Presence