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