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DL-F03
NADE
100
1 year
China
Product Description
The peak expiratory flow (PEF). also called peak expiratory flow rate (PEFR) is a person's maximum speed of expiration, as measured with a peak flow meter, a small, hand-held device used to monitor a person's ability to breathe out air. It measures the airflow through the bronchi and thus the degree of obstruction in the airways. Peak expiratory flow is typically measured in units of liters per minute (L/min).
Function
Measurement
Zone | Reading | Description |
Green Zone | 80 to 100 percent of the usual or normal peak flow readings are clear. | A peak flow reading in the green zone |
Yellow Zone | 50 to 79 percent of the usual or normal peak flow readings. | Indicates caution. It may mean respiratory airway are narrowing and additional medication may be required. |
Red Zone | Less than 50 percent of the usual or normal peak flow readings. | Indicates a medical emergency. Severe airway narrowing may be occurring and immediate action needs to be taken. This would usually involve contacting a doctor or hospital. |
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