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Obstructive Lung Disease
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Obstructive Lung Disease
, Obstructive Lung Function
See Also
Pulmonary Function Test
Lung Volume
s
Diffusing Capacity
Inhalation Challenge Test
Exercise Spirometry
Functional Residual Capacity
Vital Capacity
Peak Expiratory Flow Rate
(
PEFR
)
Spirometry Lower Limit of Normal
(
PFT LLN
)
Restrictive Lung Disease
Causes
Alpha-1-Antitrypsin Deficiency
Asthma
Bronchiectasis
Bronchiolitis Obliterans
Chronic Obstructive Pulmonary Disease
Cystic Fibrosis
Silicosis (early stages)
Diagnosis
Pulmonary Function Test
Findings
Criteria
FEV1 to FVC Ratio <0.7 (or <LLN or for children<85% of predicted) AND
Normal FVC or FVC response to
Bronchodilator
Approach
Assess Severity
See FEV1 interpretation above
Assess
Bronchodilator
response
Bronchodilator
response with FEV1 or FVC increased >12% at any age (or >200 ml in adults)
Consistent with reversible Obstructive Lung Disease (
Asthma
)
Inadequate
Bronchodilator
response
Consistent with irreversible Obstructive Lung Disease (
COPD
)
References
Johnson (2014) Am Fam Physician 89(5): 359-66 [PubMed]
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