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BOOK PFTS EXAM 2025 QUESTIONS AND ANSWERS In general obstructive ventilatory defect is considered reversible if ....ANSWER ...-after bronchodilator administration the FEV or FVC increases by more than 12 % and 200 mL The residual volume and the capacities that include it ( FRC and TLC ) are not recorded on a simple spirogram because - ....ANSWER ...-this volume remains in the lungs at all times . XTypically , the SVC is measured using a respirometer The SVC measurement can help in - ....ANSWER ...-assessing perioperative risk because it reflects the patient's ability to take a deep breath cough and clear the airways of excess secretions In gen eral , SVC values lower than 20 mL / kg of predicted body weight indicate ....ANSWER ...-an increased risk for postoperative respira tory complications also The most commonly cited threshold is 15 ml kg with values - ....ANSWER ...- commonly lower values indicating inade quate ventilatory reserve and the need for mechanical tilatory support A normal individual is able to exhale at least_____of FVC in 1 second and generally ___or more in 3 seconds - ....ANSWER ...-75% and 95% ...©️ 2025, ALL RIGHTS RESERVED 1