Measures of Respiratory Health (MRH) (MRH)

Participants with CF

Inclusion criteria:

1. 2.5 - 18 years of age at enrolment

2. Diagnosis of CF as evidenced by one or more clinical feature consistent with the CF phenotype or positive CF newborn screen AND one or more of the following criteria:

   1. A documented sweat chloride ≥ 60 mEq/L by quantitative pilocarpine iontophoresis (QPIT)
   2. A documented genotype with two disease-causing mutations in the CFTR gene
3. Informed consent by participant, parent, or legal guardian
4. Ability to perform technically acceptable MBW measurements

Exclusion criteria:

1. Physical findings at screening that would compromise the safety of the participant as judged by the patient's most responsible physician
2. Requirement of supplementary oxygen to maintain an oxygen saturation above 95%

Participants with other respiratory disease

Inclusion criteria:

1. MD diagnosed lung disease and/or attending the Pulmonary Function Laboratory
2. 2.5 - 18 years of age at enrollment
3. Informed consent by participant, parent, or legal guardian
4. Ability to perform technically acceptable MBW measurements

Exclusion criteria:

1. Physical findings at screening that would compromise the safety of the participant or the quality of the study data.
2. Requirement of supplementary oxygen to maintain an oxygen saturation above 95%

Healthy Participants

Inclusion criteria:

1. 2.5 - 30 years of age at enrollment
2. Informed consent by participant, parent, or legal guardian
3. Ability to perform technically acceptable MBW measurements

Exclusion criteria:

1. Physical findings at screening that would compromise the safety of the participant or the quality of the study data.
2. Evidence of a chronic disease process such as lung disease