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A peak-flow meter is a portable hand held plastic device which helps asthma sufferers to measure how quickly their lungs can expel (blow out) air.
A peak-flow meter works by measuring how fast you’re able to breathe out. It has a numbered scale on the side that measures the force of your breath in litres per minute.
Peak-flow meters are recommended by doctors to asthma sufferers to help them to track their asthma. Even if you don’t feel any symptoms, the peak-flow meter can help you to detect any narrowing in your airways before your asthma symptoms get worse. This means that you can take steps to avoid your asthma worsening, such as adjusting your medication.
A peak-flow meter is a type of lung function test that can help you to identify what could be making your asthma worse, if your treatment is working well enough, and if you need to get emergency medical help.
A peak-flow meter can be used by children as young as five as well as adults and young people.
The peak flow test, also known as a peak expiratory flow test or PEF, shows how well your lungs are working by measuring how fast you breathe out.
The test helps both you and your doctor to monitor your asthma by recording how well the airways in your lungs are working.
A peak flow test is usually done at your annual asthma review appointment as part of routine asthma-management checks. Your doctor may also recommend that you carry out regular peak flow tests at home using a peak-flow meter, and keep a diary of the numbers.
Peak flow scores vary according to the age, height and gender of each patient.
Monitoring your peak flow can help you to identify if your asthma symptoms are getting worse at all and can alert you to taking action such as taking your inhaler or getting medical help.
A peak-flow meter is a hand held plastic tube with a mouthpiece on one end, which you breathe into as hard as possible. The scale on the side measures how strong your out breath is. This measurement is your ‘peak flow’.
To use the device:
If you suffer from asthma, or if your doctor suspects that you have untreated asthma, they may recommend that you use a peak-flow meter to monitor the function of your lungs. They might ask you to record your daily peak flow readings by writing them down for a couple of weeks.
Once you’ve recorded your results you will usually need to return to your doctor or asthma nurse to show them your readings. They will use the results to monitor your asthma by following the pattern of your scores. Your lung function can then be measured against your best peak flow score to see how you are doing and if you need an adjustment to your asthma medication or further medical help.
You can get a prescription from your doctor for a peak-flow meter or you can buy one from a pharmacy or online.
A peak-flow meter measures the strength of the airflow from your lungs and can help you and your doctor or asthma nurse to monitor your asthma. If your doctor suspects that you may have asthma, readings from a peak-flow meter can help them in their diagnosis.
Peak-flow meters are also used during asthma attacks to show how severe the attack is and check how well you are responding to treatment.
In chronic asthma sufferers, your peak-flow meter scores are used to check your progress and determine if any changes are needed in the treatment and management of the condition.
Keeping track of regular peak-flow scores in a diary can help to identify if your lung function is getting worse before you may have even noticed any symptoms such as coughing or wheezing. A drop in your peak-flow meter scores can indicate problems with your airways.
Monitoring any changes in your peak-flow readings can help to detect the warning signs and prevent asthma attacks before they start.
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