1. nNO is effective for diagnosing PCD with 98% sensitivity. 2. Must be used with other diagnostic methods, not standalone. 3. Cutoff for children aged 5+ is 77 nL/min. 4. Respiratory infections can significantly lower nNO values. 5. Variability in nNO performance across genetic subtypes. 6. Technical factors affect test performance. 7. Electrochemical devices are more accessible alternatives. 8. Highlighted need for a multimodal approach for accurate diagnosis.