<unk> <unk>  meter (made in USA)<unk> <unk>  readings are higher when patients are well, and lower when the airways are constricted. From changes in recorded values, patients and doctors may determine lung functionality, the severity of asthma symptoms, and treatment. Measurement of<unk> R requires training to correctly use a meter and the normal expected value depends on the patient's sex, age, and height. It is classically reduced in obstructive lung disorders such as asthma. Due to the wide range of 'normal' values and the high degree of variability,<unk> <unk>  is not the recommended test to identify asthma. However, it can be useful in some circumstances. A small portion of people with asthma may benefit from regular<unk> <unk>  monitoring. When monitoring is recommended, it is usually done in addition to reviewing asthma symptoms and frequency of reliever medication use. When<unk> <unk>  is being monitored regularly, the results may be recorded on a<unk> <unk>  chart. It is important to use the same<unk> <unk>  meter every time.
Peak expiratory flow
Peak inspiratory pressure
Tidal volume
Lung compliance
Ventilatory threshold
FEV1/FVC ratio
Functional residual capacity
Lung volumes