FeNO does not diagnose asthma alone. It is interpreted with symptoms, examination, lung function, allergy history and treatment use.
Severe breathing difficulty, chest indrawing, blue lips, drowsiness, poor feeding, grunting, pauses in breathing, persistent fast breathing, low oxygen — these are not for online review. Go to in-person pediatric emergency care.
What parents usually notice.
- Child has asthma-like symptoms or difficult control
- Doctor wants to understand type-2/allergic airway inflammation
- Report number seems high or low and parents are confused
Common reasons doctors think about.
- Asthma phenotyping and adherence clues
- Allergic airway inflammation assessment
- Monitoring selected children with recurrent symptoms
What a pediatric pulmonologist checks.
- Current inhaled steroid use and adherence
- Allergic rhinitis and eczema
- Spirometry/oscillometry and symptom control
- Whether the result will change management
What not to do blindly.
- Do not diagnose asthma from FeNO alone
- Do not change medicines from one number without review
- Do not ignore technique and symptom diary
- Do not compare numbers without age/context
Related guides.
Asthma is a repeating pattern of cough, wheeze, tightness, breathlessness, night symptoms, exercise symptoms, or recurrent “chest congestion.”...
Spirometry is useful, but it must be interpreted with symptoms, technique quality, age, height, and clinical context....
Allergic rhinitis causes repeated sneezing, itching, runny or blocked nose, and can interact with asthma and sleep-breathing symptoms....