Lab
Functional Residual Capacity
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Functional Residual Capacity
, FRC
See Also
Pulmonary Function Test
Lung Volume
s
Diffusing Capacity
Inhalation Challenge Test
Exercise Spirometry
Vital Capacity
Peak Expiratory Flow Rate
(
PEFR
)
Spirometry Lower Limit of Normal
(
PFT LLN
)
Obstructive Lung Disease
Restrictive Lung Disease
Images
Physiology
Volume remaining in lungs at resting expiratory level
Equivalent to alveolar volume (Va)
Respiratory
Bronchi
oles and alveolar ducts: 30-40%
Alveoli: 60-70%
Calculation: ERV + RV
Normal adult: 1.8 to 3.4 Liters
Causes
Factors that increase FRC (Hyperinflation)
Emphysema
Aging
Asthma
Peribronchial fibrosis
Causes
Factors that decrease FRC
Age
Obesity
Supine
Posture
Sedation
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