• Intermittent Level: This is the most serious level of asthma. A person is considered to be at this level when they show symptoms of asthma are not more than 2 times a week and did not wake up at night with asthma symptoms more than twice a month. At this level, asthma attacks can last from several hours to several days, but no symptoms of an asthma attack. Between asthma attacks peak expiratory flow or “PEF” is normal and varies less than 20%. The PEF is a measure of the flow of air into the lungs. A peak flow meter is used to obtain PEF reading.

• mild persistent: Someone at this level have asthma symptoms more than 2 times a week but not every day, and will have a night asthma symptoms more than twice each month. At this level, asthma attacks can slow down their daily activities. The PEF reading will vary by 20% to 30%.

• Medium persistent: Someone at this level have asthma symptoms every day and have asthma symptoms at night about once a week. An asthma attack can occur at least 2 times a week and lasted for several days. At this stage, someone will use short-acting inhaled asthma medication every day. An asthma attack is not only slow down the daily activities but may actually prevent some of them. PEF reading may vary by more than 30%.

• Severe persistent: This is the most serious level of asthma. Someone at this level show the symptoms of asthma at all times both day and night. Asthma symptoms severely limit one’s physical activity, and the Common asthma attack

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