Peak Flow Meters Are Available and Recommended for Use in Australian General Practice
Peak flow meters (PFMs) should be readily available in Australian GP clinics, as they are essential tools for assessing and managing respiratory conditions, particularly asthma and COPD. The Thoracic Society of Australia and New Zealand explicitly recommends peak flow monitoring for establishing asthma diagnosis, measuring severity, assessing treatment response, and recognizing deteriorating asthma 1.
Evidence Supporting Availability in Primary Care
The British Thoracic Society guidelines, which inform Australian practice, consistently reference peak flow meter use in general practice settings for:
- Acute asthma assessment: GPs should measure PEF when evaluating patients with respiratory symptoms, using it to determine whether home treatment is appropriate or hospital admission is needed 2
- Treatment monitoring: The guidelines specify that response to treatment "MUST be assessed before you leave" when treating acute asthma at home, requiring PEF measurement 2
- COPD assessment: Before prescribing nebulizer therapy in general practice, patients should undergo peak flow monitoring at home as part of their assessment 3
Practical Implementation
When PEF Should Be Used in GP Clinics:
Acute presentations:
- Any patient presenting with respiratory symptoms suggesting asthma exacerbation
- PEF >50% predicted/best = consider home treatment with close monitoring
- PEF <50% predicted/best = treat as severe attack and consider admission 2
Chronic management:
- 2-3 week monitoring periods to evaluate treatment changes 4
- Establishing personal best PEF values
- Identifying environmental triggers (may require 4+ measurements daily) 4
Discharge planning:
- All patients discharged from hospital should receive their own PEF meter 2
- GP follow-up within 1 week should include PEF monitoring
Recent Evidence on Utility
Recent research confirms PEF meters remain valuable in primary care:
- High sensitivity (82.4%) for detecting airflow limitation in primary care settings with respiratory symptoms 5
- Particularly useful as an initial screening tool in resource-limited settings 5
- Effective for narrowing down suspected COPD cases requiring spirometry 6
Important Caveats
Limitations to recognize:
- PEF should not be used as a stand-alone diagnostic tool due to lower specificity (44.4%) 5
- Requires proper technique instruction and verification of patient's ability to record reliably 3
- Long-term daily monitoring is NOT recommended for mild intermittent or mild persistent asthma unless specifically useful for therapeutic decisions 4
- Adherence to long-term monitoring can be challenging 4
Technical considerations:
- Devices show variable performance across flow ranges, with some exhibiting significant deviations at lower flows 7
- Best of three readings should be recorded 3
- Measurements should be taken twice daily (morning and evening, before treatment) when monitoring 3
Bottom Line for Australian GPs
Peak flow meters are inexpensive, portable, and widely available devices that should be standard equipment in every Australian GP clinic. They serve as essential point-of-care tools for acute assessment and complement (but do not replace) spirometry for diagnosis. The key is ensuring proper technique and using PEF measurements as part of a comprehensive assessment rather than in isolation.