Peak expiratory flow

Peak Expiratory Flow

The Peak Expiratory Flow (PEF), also known as Peak Expiratory Flow Rate (PEFR), is a person's maximum speed of expiration. It can be measured by a Peak flow meter or by a spirometer. It is a large part of the lung function test (also known as a pulmonary function test) and is highly important in monitoring the condition of patients with asthma.

Measurement

PEF can be measured using a peak flow meter, which is a simple, portable, inexpensive device. The patient takes a deep breath and then exhales into the device as hard and fast as possible. The measurement is typically taken in the morning and evening, and the results are recorded for comparison and trend analysis.

Clinical significance

PEF is a key measurement in the diagnosis and management of asthma. It can help to determine the severity of the asthma, monitor the response to treatment, and identify triggers. It is also used in the management of other respiratory conditions such as chronic obstructive pulmonary disease (COPD).

Limitations

While PEF is a useful tool, it has some limitations. It is effort-dependent, meaning the results can vary based on the patient's effort. It is also less accurate in measuring lower airway obstruction compared to other tests such as spirometry.

See also

• Spirometry
• Asthma
• Chronic obstructive pulmonary disease

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References

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External links

• NHS: Peak Flow Test
• Asthma UK: Peak Flow

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  Peak flow meter horizontal view
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  Peak flow meter
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  Normal values for peak expiratory flow - EU scale