General Tools - Peak Flow Zone Chart
The following table shows an example of how these zones work. Your doctor can help you create a similar table for your own asthma.
Green: 80-100% of your personal best
- Your breathing is good.
- You do not have any early warning signs or asthma symptoms.
- Take all your medicines every day, as your doctor tells you.
- Take your inhaler before exercise, as your doctor tells you.
Yellow: Caution 60-80% of your personal best
- Runny, stuffy nose.
- Feel more tired.
- Chin or throat itches.
- Red or pale face
- Dark circles under your eyes
- Use "rescue" medicine
- Recheck peak flows after 20-30 minutes
- Call your doctor, healthcare professional, or nurse care manager:
- if your peak flow is not back to the Green Zone
- if your peak flow drops into the Yellow Zone again in less that 4 hours.
Red: Danger Below 60% of your personal best
- Cough, more at night
- Chest feels tight or hurts
- Breathing faster than normal
- Get out of breath easily
- Use your quick-relief medicine by inhaler or nebulizer right away!
- Call your doctor or 911 NOW
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