Skip main navigation

Serial PEF measurements as a diagnostic tool

PEF meter
0.6
To do PEF-measurements, you need a PEF-meter. PEF-meters come in different designs. This is one example.We will now demonstrate how to use the PEF-meter. Move the indicator to the lowest end of the numbered scale. Inhale deeply and blow out as forcefully as you can.
26
Repeat two more times…and write down the highest result from the three attempts. After several weeks the results can be plotted
41.6
into a diagram like this: In this figure, the time elapsed or days, are shown on the X-axis. The Y-axis shows the PEF measurements, given as the maximum value, shown as the green line, the minimum value, shown as the blue line, and the mean value, the red line, for each single day. The patient was AT work on the days shown in yellow and NOT at the workplace on the days indicated by the grey colour. As you can see, in this graph, there was a tendency for the PEF-values to be lower on workdays (yellow colour), compared to days out of the workplace (the grey colour). Within the workdays, you can even see a tendency of more variable PEF values.
94
In this case the measurements are indicative of a work-related asthma.

As we just have shown you, serial measurements of PEF, several times a day, and both on days at and away from work, can be used as a diagnostic tool for a possible work-related asthma.

PEF diagram After several weeks the results can be plotted into a diagram like this. In this case the measurements are indicative of a work-related asthma. © University of Bergen/Arjun Ahluwalia

This article is from the free online

Occupational Health in Developing Countries

Created by
FutureLearn - Learning For Life

Our purpose is to transform access to education.

We offer a diverse selection of courses from leading universities and cultural institutions from around the world. These are delivered one step at a time, and are accessible on mobile, tablet and desktop, so you can fit learning around your life.

We believe learning should be an enjoyable, social experience, so our courses offer the opportunity to discuss what you’re learning with others as you go, helping you make fresh discoveries and form new ideas.
You can unlock new opportunities with unlimited access to hundreds of online short courses for a year by subscribing to our Unlimited package. Build your knowledge with top universities and organisations.

Learn more about how FutureLearn is transforming access to education