Pulmonary Function Tests (PFT)- Questions and Answers
100% Pass
How air flows Correct Ans-Air flows from higher to lower pressure. There is a balance
between forces: pressures trying to collapses and structures trying to keep airways open.
FVC Correct Ans-Forced Vital Capacity (when person is forcing air out)
FEV1 Correct Ans-Forced Expiratory Volume in one second. (Amount of air that can be
blown out of lungs in one second)
FEV1:FVC Correct Ans-Ratio of Forced Expiratory Volume in one second to Forced Vital
Capacity
PEFR Correct Ans-Peak Expiratory Flow Rate
Normal PFT values Correct Ans-Based on height, age, gender
Causes of abnormal values: Obstruction Correct Ans-1. Narrowing: bronchospasms,
inflammation
2. Material inside airways: mucous, foreign bodies, tumor
3. Destruction of lung tissue: loss of elasticity or external support of airways.
4. Atrophy or airway wall: increased collapsibility
5. External compression of airway: tumor, edema
, Pulmonary Function Tests (PFT)- Questions and Answers
100% Pass
3. Neuromuscular disease: generalized weakness, diaphragm paralysis, etc.
4. Poor effort
What is the primary function of the lungs? Correct Ans-1. Oxygenation of mixed venous
blood.
2. Removal of carbon dioxide from mixed venous blood.
Primary function depends on the integrity of 4 things: Correct Ans-1. Airway
2. Pulmonary vasculature
3. Respiratory muscles
4. Respiratory control mechanism
PFTs help determine 7 things: Correct Ans-1. Presence of disease or abnormal lung
function.
2. Extent of dysfunction.
3. Extent of impairment/disability
4. Progression of disease.
5. Nature of physiological disturbance.
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