Interpretation Guidelines 1


  • Normal for FVC, FEV1, FEF25%-75%, and PEFR is between 80% and 120% of what has been predicted for the patient.
  • Often, the test is performed before and after the administration of a bronchodilator. Improvement is noted as in the table below:
spirometry interpretation guidelines table


spirometry interpretation guidelines chart

Authored by William A. French. Medically reviewed by Dr. Barbara Erickson, PhD, RN, CCRN.

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