Rationale and key points

Peak expiratory flow rate (PEFR) is an important test in the diagnosis and monitoring of respiratory conditions, especially asthma. PEFR measures the speed at which air is forcefully exhaled from full inspiration, expressed in litres per minute (L/min). It involves using a peak flow meter – a simple, affordable, portable and widely available device that can be used in clinic or home settings. Nurses obtaining a patient’s PEFR must have the knowledge and skills required to do so safely and effectively and must work within their level of competence.

• PEFR is a simple-to-obtain measure that records the maximal flow rate of air that can be achieved in one forceful expiration following a full inspiration.

• Where possible, it is advisable that patients and/or carers learn how to perform the test themselves, so that they can self-manage and monitor conditions such as asthma and chronic obstructive pulmonary disease.

• The procedure is simple to teach, but it is necessary to use the correct technique to achieve accurate results.

Reflective activity

‘How to’ articles can help to update your practice and ensure it remains evidence-based. Apply this article to your practice. Reflect on and write a short account of:

• How this article might improve your practice when obtaining a patient’s PEFR.

• How you could use this information to educate nursing students or colleagues about the technique for obtaining an accurate PEFR.