Analysing the serial plot

The peak flow can be plotted in the conventional manner with each reading plotted against the time. 

The background is grey when the patient is asleep, white when away from work and various colours when working to depict each type of shift.

The relationship with peak flow with work is much less obvious in this tracing. All of these readings have been utilised in the graphs of daily maximum, mean and minimum.


The PEFR shows a very wide daily variability of greater than 20% and is suggestive of asthma.

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