Peak Flow Calculator

What is peak flow calculator?

A peak flow calculator is a tool used to measure a person's peak expiratory flow (PEF), which is the maximum speed at which a person can exhale air. It is often used to monitor and manage respiratory conditions such as asthma. By measuring PEF regularly, individuals can track their lung function and determine if their airways are narrowing or becoming inflamed.

What are the types of peak flow calculator?

There are several types of peak flow calculators available, each with its own features and functionality. Some common types include:

Hand-held peak flow meters
Digital peak flow meters
Smartphone apps with peak flow measurement capabilities

How to complete peak flow calculator

To complete a peak flow calculator, follow these steps:

01
Take a deep breath and exhale as forcefully as possible into the peak flow meter.
02
Record the highest value displayed on the meter.
03
Repeat the process three times and record the highest value each time.
04
Calculate the average of the three highest values.
05
Compare the average value to a personal best value or a predicted value based on age, height, and gender.
06
Take any necessary actions based on the results, such as adjusting medication or seeking medical attention if necessary.

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Questions & answers

Peak expiratory flow (PEF) is measured in litres per minute. Normal adult peak flow scores range between around 400 and 700 litres per minute, although scores in older women can be lower and still be normal. The most important thing is whether your score is normal for you.
You take the biggest breath in that you can. Then blow out as fast as you can, into a small, hand-held plastic tube called a peak flow meter. You don't need to empty the lungs completely – just a short, sharp blow, as if you're blowing out a candle. The measurement taken is called your peak flow.
Peak expiratory flow is estimated via one of the three formulas, depending on whether the patient is a child, adult female or male. Children PEFR = ((Height in cm - 100) x 5) + 100. Adult Men = (((Height in m x 5.48) + 1.58) - (Age x 0.041)) x 60. Adult Women = (((Height in m x 3.72) + 2.24) - (Age x 0.03)) x 60.
Peak expiratory flow [L/min] = (Body height [cm] x 5.3) – 433. Conclusions: In some situations, especially in emergency settings, the presented formula may prove useful in predicting peak expiratory flow knowing only a child's body height.
How to use your peak flow meter Move the marker to the bottom of the numbered scale. Stand up straight. Take a deep breath. Hold your breath while you place the mouthpiece in your mouth, between your teeth. Blow out as hard and fast as you can in a single blow. Write down the number you get.
The Smart Peak Flow app is free, although you will need to have a Smart Peak Flow meter to use it. The meter is a small reusable device, it measures your peak flow using light sensor technology and sends it to the app. It works with any smartphone and connects by the audio jack.