Peflog user instructions

Using Peflog is easy and it supports you in ensuring your asthma is under control. Use your asthma meter according to instructions and then save the provided values into Peflog asthma tracker app.

Using a PEF meter

A peak flow meter is an inexpensive, portable, handheld device used to measure how well air moves out of the lungs. Measuring and monitoring your peak flow using the meter is an important part of managing asthma.

PEF reporting is easy

There are just three simple steps in managing asthma. Use your PEF meter according its instructions to get the results and save them to PEFLog and inspect results or send PEF reports to your own doctor. 


Note! If you haven't yet upgraded to Peflog 4, then see the Peflog 3 user instructions

Save the PEF values

Set the three values provided by PEF meter into Peflog . You can also provide additional information like e.g. occasion (work, travel…) and other comments in order to figure out if certain occasions correlate with a PEF values.

Check the report

Peflog Log reports provides invaluable information about asthma status. There is lot of important information available about asthma e.g. by Asthma and Allergy Foundation of America

The application draws the chart of the measurements and indicates alarming daily variation (>20%) with red colour. It’s easy to check and share the report any time (for instance after the monitoring period).

You can zoom the report by pinch-zooming and pan it by tap-and-move. You can also select the data range by tap-and-hold and then move to another date.  If you have zoomed the chart, then you can quickly scroll or zoom out by using touch sensitive areas at the bottom of the chart. Pressing PDF icon will prepare a report ready to be shared. The report includes the chart, additional information and detailed results. 

Note! Bronchodilatation is calculated when the duration between the puff without medication and the time with medication is less than one hour.

In order to take a deeper look at the report, you can rotate the device and turn into a landscape mode. Landscape mode is optimised for viewing the report and it occupies whole screen. 

Color zones

Color zones in the chart

The color zones illustrated in the chart can be used to show you the effectiveness of your breathing. Ideally, your PEF trend should remain in green zone. The zones are based on the personal best PEF.  Note! The personal best reading is calculated automatically if not provided manually in the My Details -page. If you provide personal best value manually then the color zones are based on it.

Green: 80-100% of your personal best

Yellow: 50-80% of your personal best

Red: Below 50% of your personal best

Colors in the Log-page 

Readings are illustrated in green except when too much (80%) below the best reading so far. Note! The best reading is calculated automatically if not provided manually in the My Details -page. 

For instance, if the new reading goes below 80% the best reading so far, then the color of the new reading is yellow. On the other hand, if the new reading is above the best reading so far, then the color of the new reading is green but all future readings will be compared against the new reading. I.e. the new reading becomes the new best PEF.

This logic is especially relevant for children because their PEF readings often improve as the child grows. The continuous improvement of PEF readings doesn’t mean that past readings suddenly become any worse and color should change. So, green readings in the past should remain green regardless if future readings become higher.

This logic means that the color of the readings is always determined by the current situation and the best PEF before it. The logic is applied in the Log-page and all PEF readings are taken into account.


Modify readings

Tapping titles collapses (closes) and uncollapses (opens) the groups. The arrow on the right side indicates if the group is collapsed or not. Tapping the item will allow you to delete or modify it. 

CSV files

You can export data to a CSV file for e.g. inspecting and analysing it with your computer's spreadsheet program. It is also possible to try to import CSV file that contains readings, but the format of the CSV must be exactly such that Peflog understands it. CSV files can also be used as a backup if you use the application without logging in. When you log in with Email, Google or Apple (iOS devices) account, then there is no need for backups because the data will always be synchronised to all your devices where you log in to Peflog using the same account.


date, "[puff1, puff2, puff3]", medication yes or empty, "[occasion1, occasion2, etc]", "[comment1, comment2, etc]"


2022-01-20 22:40:00.000, "[625, 630, 625]", Yes, "[Home, Evening]", "[Seretide, Fluticasone]"