When asthma is suspected, which of the following is NOT useful in making a diagnosis?
A. Decreased FEV1/FVC ratio
B. Decreased FEV1
C. Some reversibility with administration of bronchodilator
D. Peak flow meter reading
ANS: D
Pulmonary function tests or spirometry provide diagnosis of asthma; diminished forced expiratory volume in 1 second (FEV1)/forced vital capacity (FVC) ratio with diminished FEV1 If they are the same, please choose one and use throughout to indicate obstructed outflow. Some degree of reversibility occurs with administration of bronchodilators. Chest films are generally within normal limits unless there is significant air trapping. Peak flow meters should not be used as diagnostic tools. They are appropriate for monitoring ongoing symptoms and determining the response to therapy, particularly once a patient's "personal best" is determined.
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