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FeNO: fractional exhaled nitric oxide; COPD: chronic obstructive pulmonary disease; ACOS: asthma-chronic obstructive pulmonary disease overlap syndrome; ppb: parts per billion
| Patient number | FeNO levels (ppb) | Initial diagnosis | Final diagnosis | Presenting symptom(s) |
| 1 | 30 | none | Asthma | Dyspnea |
| 2 | 28 | none | Asthma | Sarcoidosis, cough |
| 3 | 8 | none | Asthma | Dyspnea |
| 4 | 25 | none | Asthma | Dyspnea, cough |
| 5 | 13 | none | Asthma | Dyspnea, cough |
| 6 | 26 | none | ACOS | COPD exacerbation |
