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Summary of recommendations
| Infant | Preschool | Patients with CF with FEV1 in Normal Range | |
|---|---|---|---|
| Tracer gas | SF6-based only in specialized centers | N2-based commercial systems | N2-based commercial systems |
| Single-center trials | Yes (in specialized centers) | Yes | Yes |
| Multicenter trials | No | Yes (in specialized centers) | Yes |
| Clinical practice | No | No | No |
Definition of abbreviation: CF = cystic fibrosis.
