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How do you read an asthma peak flow chart?

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Quick Answer

Read an asthma peak flow zone chart by comparing the three zone percentages to your current peak flow reading, notes National Jewish Health. Reaching the green zone on the chart indicates that your current reading is 80 to 100 percent of your personal best peak flow reading. The yellow zone on the chart indicates that your reading is between 60 to 80 percent, while the red zone indicates that your reading is below 60 percent.

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Full Answer

When your breathing tests in the green zone, you should experience no asthma symptoms or breathing problems, according to National Jewish Health. However, you should still take your prescribed asthma medications and use your inhaler as directed.

In the yellow zone of the peak flow zone chart, you may feel tired, sneeze and cough, explains National Jewish Health. You may also look pale, have a runny nose or an itchy throat. You should use your rescue medicine and take another peak flow reading in approximately 30 minutes. If your peak flow reading is not in the green zone after the second reading, or if it drops into the yellow zone within the next four hours, you should contact your doctor.

In the red zone, you should immediately use your inhaler or nebulizer, according to National Jewish Health. You may experience wheezing, rapid breathing, coughing or a tightness in your chest. You should also call your doctor or 911 as soon as possible.

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