Rheumatoid Factor and ANA negative,
Erythrocyte Sedimentation Rate and
Mannitol powder inhalation bronchial challenge Case Photo #1 shows significantly reduced Forced Expiratory Volume in 1 second (FEV1), at 46% of the predicted value for age/gender, and other abnormal parameters. FEV1 is the most widely used criterion for determining airway obstruction.
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