What is the normal PEF value?
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.
How is PEF asthma measured?
How Do I Use a Peak Flow Meter?
- Place the indicator at the base of the numbered scale.
- Stand up.
- Take a deep breath.
- Place the meter in your mouth between your teeth and close your lips around the mouthpiece.
- Blow out as hard and fast as you can in a single blow.
- Write down the number you get.
What is PEF in spirometry?
Peak expiratory flow (PEF), the maximal flow that can be exhaled when blowing out at a steady rate. Forced expiratory flow, also known as mid-expiratory flow; the rates at 25%, 50% and 75% FVC are given. Inspiratory vital capacity (IVC), the maximum amount of air that can be inhaled after a full expiration.
How do you read a peak flow meter?
Raise the meter horizontally, inhale deeply, then place your mouth over the mouthpiece and blow forcefully. Make sure your lips act as a seal over the mouthpiece so that no air escapes. The red piston will slide up the scale. The number that it stops on is your peak flow reading.
What are the stages of asthma?
Levels of Asthma
- Step 1 – mild intermittent asthma. Symptoms fewer than two times a week.
- Step 2 – mild persistent asthma. Symptoms more than two times a week, but no more than once a day.
- Step 3 – moderate persistent asthma. Symptoms every day.
- Step 4 – severe persistent asthma. Constant symptoms.
What is type2 asthma?
Type 2 asthma is characterised by Type 2 inflammation and typically includes allergic asthma, exercise-induced asthma, and late-onset eosinophilic asthma. Understanding of allergic, eosinophilic, and mixed allergic/eosinophilic phenotypes has greatly advanced and may underpin new approaches to improve asthma control.