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Functional Residual Capacity
Aka: Functional Residual Capacity, FRC
- See Also
- Pulmonary Function Test
- Lung Volumes
- 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 Bronchioles 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