Asthma: Inhaler Technique, Peak Flow Zones, and the Action Plan
Teach the difference between the daily controller and the reliever, correct metered-dose inhaler technique with a spacer, and mouth rinsing after an inhaled corticosteroid. Peak flow zones: green 80 to 100% of personal best, yellow 50 to 79%, red below 50%. Reliever use for symptoms more than 2 days a week indicates poor control; red-zone readings that do not improve, difficulty speaking, or cyanosis require 911.
Who needs this teaching
Every client with asthma and the caregiver of a child with asthma. Asthma is chronic airway inflammation with airway hyperresponsiveness and variable airflow obstruction. A written action plan and correct inhaler technique reduce exacerbations and emergency visits.
The priority teaching points
- Controller versus reliever. Controller medications, such as inhaled corticosteroids, treat airway inflammation. Take them every day, even without symptoms. Reliever medications, such as albuterol, relax bronchial smooth muscle within minutes. Some clients use one budesonide-formoterol inhaler as both controller and reliever; follow the prescribed regimen. Current guidelines do not recommend short-acting beta2 agonist treatment alone for adults and adolescents.
- Metered-dose inhaler with a spacer. Remove the cap and shake the inhaler when the label directs. Prime it when new or unused. Insert it into the spacer. Exhale fully away from the spacer. Seal the lips around the mouthpiece and press the canister once. Inhale slowly and deeply, then hold the breath for up to 10 seconds. Release one puff at a time and wait between puffs as the label directs. A whistle from the spacer indicates inhalation that is too fast.
- Inhaled corticosteroid care. Rinse the mouth with water and spit after each dose. Rinsing prevents oral candidiasis and dysphonia.
- Peak expiratory flow zones. Establish the personal best over 2 to 3 weeks of good control. Stand, blow hard and fast 3 times, and record the highest reading. Green zone, 80 to 100% of personal best: continue the daily plan. Yellow zone, 50 to 79%: use the reliever and follow the yellow-zone steps. Red zone, below 50%: use the reliever now and seek emergency care.
- Trigger control. Avoid tobacco smoke and vaping aerosol. Reduce exposure to dust mites, pet dander, mold, pollen, cockroaches, strong odors, and air pollution. Report aspirin or NSAID sensitivity. Nonselective beta blockers, including eye drops, cause bronchospasm. Keep the yearly influenza vaccine.
- Assessing control. Reliever use for symptoms more than 2 days a week indicates poor control. Use before exercise as prescribed does not count. Night waking from asthma and activity limitation also indicate poor control.
- Red-zone actions. Use the reliever immediately as the action plan directs and call the provider. Call 911 for difficulty speaking or walking from dyspnea, cyanosis, retractions, or no improvement after the reliever.
Red flags the client reports
| Call the provider the same day | Call 911 or the local emergency number |
|---|---|
| Yellow-zone readings that do not return to green after the reliever | Red-zone readings that stay below 50% after the reliever |
| Reliever use for symptoms more than 2 days a week | Difficulty speaking or walking because of shortness of breath |
| Night waking with cough or wheezing | Cyanosis of the lips or nail beds |
| Asthma symptoms that limit usual activity | Suprasternal or intercostal retractions |
Teach-back questions
- "Show me how you use your inhaler with the spacer."
- "Which inhaler do you use every day, and which one do you use for symptoms?"
- "What do you do after your steroid inhaler?"
- "Your personal best is 400. Which zone is a reading of 250?"
- "Which symptoms mean you call 911?"
Teaching tips
- Inhaler technique errors are common. Observe a full return demonstration at every visit.
- Write the personal best and the zone numbers on the action plan.
- Label each inhaler "every day" or "rescue".
- For a child, include every caregiver and give a copy of the plan to the school.
Read more on NCLEXPace
- COPD vs Asthma on the NCLEX (and Why Oxygen Orders Differ)
- Respiratory Map: COPD, Asthma, Pneumonia, PE, and Chest Tubes
Sources
- Harding MM, Kwong J, Hagler D, Reinisch C. Lewis's Medical-Surgical Nursing: Assessment and Management of Clinical Problems. 12th ed. Elsevier; 2023; Chapter: Obstructive Pulmonary Diseases.
- Global Initiative for Asthma (GINA). Global Strategy for Asthma Management and Prevention, 2025 Update. GINA; 2025.
- National Asthma Education and Prevention Program. Expert Panel Report 3: Guidelines for the Diagnosis and Management of Asthma. National Heart, Lung, and Blood Institute; 2007.
- Cloutier MM, et al. 2020 Focused Updates to the Asthma Management Guidelines: A Report From the National Asthma Education and Prevention Program Coordinating Committee Expert Panel Working Group. J Allergy Clin Immunol. 2020;146(6):1217-1270.
Why this matters for the NCLEX
Teaching is effective when the client states, "I use my steroid inhaler every day and rinse my mouth afterward," and "A reading below half my personal best means I use my rescue inhaler and get help now." Statements requiring further teaching include, "I use my steroid inhaler when I start wheezing," and "Using my rescue inhaler every day shows my asthma is controlled."
When an inhaled bronchodilator and an inhaled corticosteroid are both scheduled, NCLEX items expect the bronchodilator first.
Frequently asked questions
Is a rescue inhaler alone enough for an adult with asthma?
No. Current guidelines do not recommend short-acting beta2 agonist treatment alone for adults and adolescents. Every client in this group needs treatment that contains an inhaled corticosteroid.
How does the client find the personal best peak flow?
The client measures peak flow daily for 2 to 3 weeks while asthma is well controlled. The highest reading is the personal best; the provider directs when to recheck it.
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