What is the normal range for nitric oxide exhalation test values?

Patient's question:

What is the normal range for nitric oxide exhalation test values? For asthma testing in 12-year-old children

Doctor's answer:

Guidance: The normal reference value is (20-60)×10-9 (20-60 ppb). If there are problems detected in this general test, it is important to start treatment promptly.
Doctor's inquiry: There are many causes of childhood bronchial asthma. If a child is diagnosed with childhood bronchial asthma, parents need to cooperate with the doctor to start treatment immediately, cooperate with gastrointestinal decompression, and develop good hygiene habits. Parents should pay attention not to let their children develop picky eating habits and maintain a balanced diet.