Available tools for monitoring childhood asthma based on age
| 0–2 years | 2–4 years | 4–6 years | >6 years | |
| Symptoms | ✓ | ✓ | ✓ | ✓ |
| C-ACT/ACT | – | – | ✓ | ✓ |
| ACQ | – | – | – | ✓ |
| Exacerbations | ✓ | ✓ | ✓ | ✓ |
| Flow volume curves/BDR | – | – | (✓) | ✓ |
| PEF | – | – | (✓) | ✓ |
| Rint-IOS-FOT | – | ✓ | ✓ | ✓ |
| LCI | ✓ | ✓ | ✓ | ✓ |
| ILF | ✓ | – | – | – |
| AHR | – | – | (✓) | ✓ |
| FeNO | ✓ | ✓ | ✓ | ✓ |
| Induced sputum | – | – | – | ✓ |
| EBC | – | – | (✓) | ✓ |
Tick marks indicate relevant/available tools, while tick marks in parenthesis indicates partly relevant/available tools. C-ACT: childhood asthma control test; ACT: asthma control test; BDR: bronchodilator response; PEF: peak expiratory flow; Rint-IOS-FOT: interrupter resistance-impulse oscillometry-forced oscillation technique; LCI: lung clearance index; ILF: infant lung function; AHR: airway hyperresponsiveness; FeNO: exhaled nitric oxide fraction; EBC: exhaled breath condensate.