Optimal cut off values for eNO and bronchial provocation tests for the diagnosis of asthma
| Best cut off value | Sensitivity% (95% CI) | Specificity% (95% CI) | |
|---|---|---|---|
| eNO, exhaled nitric oxide; MCH, methacholine; AMP, adenosine 5′-monophosphate. | |||
| eNO | >7 ppb | 82.5 (67.2 to 92.7) | 88.9 (76.0 to 96.3) |
| Exercise | ⩾10% fall | 57.9 (38.5 to 70.7) | 100 (91.8 to 100) |
| MCH | ⩽3 mg/ml | 87.5 (73.2 to 95.8) | 86.7 (73.2 to 95.0) |
| AMP | ⩽150 mg/ml | 89.5 (75.2 to 97.1) | 95.6 (84.9 to 99.5) |