Answer: C) Early small airway obstruction โ
โขNormal FEVโ & FEVโ/FVC โ no major obstruction
โขLow FEFโโ โโโ โ early small airway disease
๐ซ FEFโโ โโโ Explained:
โข Reflects medium to small airway flow
โข Normal: โฅ65% predicted (wide normal range)
โข Drops before FEVโ changes
โข Variable & FVC-dependent
โข โ Not for grading severity
โข Best used as a supportive clue, not alone
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