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Functional Residual CapacityAka: FRC

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  1. See Also
    1. Pulmonary Function Test
    2. Lung Volume
    3. Vital Capacity
  2. Physiology
    1. Volume remaining in lungs at resting expiratory level
    2. Equivalent to alveolar volume (Va)
      1. Respiratory bronchioles and alveolar ducts: 30-40%
      2. Alveoli: 60-70%
    3. Calculation: ERV + RV
    4. Normal adult: 1.8 to 3.4 Liters
  3. Factors that increase FRC (Hyperinflation)
    1. Emphysema
    2. Aging
    3. Asthma
    4. Peribronchial fibrosis
  4. Factors that decrease FRC
    1. Age
    2. Obesity
    3. Supine posture
    4. Sedation

Functional Residual Capacity (C0016815)

Definition (MSH)The volume of air remaining in the LUNGS at the end of a normal, quiet expiration. It is the sum of the RESIDUAL VOLUME and the EXPIRATORY RESERVE VOLUME. Common abbreviation is FRC.
ConceptsLaboratory or Test Result (T034) , Organ or Tissue Function (T042)
MSHD005652
EnglishCapacity.functional residual, FRC, FRC - Functional residual capacity, Functional Residual Capacities, Functional residual capacity
Spanishcapacidad residual funcional
Parent ConceptsLung Volume Measurements (C0024129), Total Lung Capacity (C0040509), Static lung volume (C0429712)
SourcesAOD, LNC, MSH, SCTSPA, SNOMEDCT
Derived from the NIH UMLS (Unified Medical Language System)



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