Comparison between stationary and portable nasal nitric oxide analysers
| Stationary analyser | Portable analyser |
| Gold standard | Not gold standard |
| Chemiluminescence detection | Electrochemical detection |
| Real-time analysis with visual display | End-point analysis with no visual display |
| Measurement taken from plateau of 3 s, enabling quality assurance | No visual display; potential for measurements from technically unacceptable manoeuvres |
| Calibration required | Internal standards apply, no calibration needed |
| Approximate costs | Approximate costs |
| €45 000–50 000 for the device | €3000–4000 for the device |
| €4200 for annual maintenance | Annual maintenance is not required |
| €15 per test (including nasal olive, catheter and filters) | €15 per test (including nasal olive) |