Peak flow meters are generally not very useful in controlling asthma. Most children can be controlled with symptoms alone. Children who are able to understand when they're having trouble breathing ...

A peak flow meter is sensitive enough to detect these changes in your lungs for hours or even days before you notice asthma symptoms. Using a peak flow meter can help prevent a severe asthma attack.

TeleBreather is a remote, electronic, handheld device that one can use at home to test how well the lungs are working. It accurately measures various volumes of air that can forcibly expel from ...

Both can occur at any age. You can easily screen yourself for them by using a device called a peak-flow meter; these are quite widely available and cost around £10.