Identify the reference
Handheld graduated device. Mouthpiece at one end. Indicator moves along a flow scale
MEDIVEERSETHE PRACTICAL HUBLOOK CLOSELY / UNDERSTAND CLEARLY
Peak expiratory flow meter
Recognise the device and interpret respiratory observations in clinical context.
REFERENCE GALLERY1 / 1 reference
1
Mouthpiece
Mouthpiece: located on the reference instrument. Compare its shape and position with the apparatus used in your practical.
Zoom in, then drag to inspect. Keyboard: + / − to zoom, arrows to pan, 0 to reset. Tap the numbered markers to explore parts.
Peak expiratory flow meter — reference view
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Identify and explain
Expiratory flow moves a mechanical indicator or is measured electronically; the peak value is retained for reading.
- Handheld graduated device
- Mouthpiece at one end
- Indicator moves along a flow scale
Explain the measurement
Expiratory flow moves a mechanical indicator or is measured electronically; the peak value is retained for reading.
Interpret in context
Check technique, measurement limitations and the patient’s clinical state; a single value is not a diagnosis.
At the viva table
Try answering aloud, then open the suggested answer. Examiner questions vary.
01 / What is PEFR?
The highest flow achieved during a forceful expiration from a maximal inspiration.
02 / What units are commonly used?
Litres per minute; verify the device scale.
03 / Why is it effort-dependent?
The initial expiratory effort strongly influences the maximum flow achieved.
04 / Can it measure residual volume?
No. It measures a peak flow, not the gas volume left in the lungs.