This is a simple method of measuring airway obstruction and it will detect moderate or severe disease. The simplicity of the method is its main advantage. It is measured using a standard Wright Peak Flow Meter or mini Wright Meter. The needle must always be reset to zero before PEF is measured.
Normal values are related to the patient's height as follows:
| Height (cm) | PEFR (L/min)* |
|---|---|
| 120 | 215 |
| 130 | 260 |
| 140 | 300 |
| 150 | 350 |
| 160 | 400 |
| 170 | 450 |
| 180 | 500 |
* mean; 2 SD = ±100
An easy to remember approximation is: PEFR (L/min) = [Height (cm) - 80] x 5
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