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Lung Function Tests
 
 
Lung Function Tests
Pulmonary function tests including spirometry, flow-volume loops, lung volumes and diffusion capacity can be used to diagnose and grade obstructive or restrictive lung disease.
 

Lung Volumes

 
 

Overview

  • Lung volumes are measures of the amount of gas present within the lungs during each phase of the respiratory cycle. These volumes can be used clinically to diagnose respiratory disease.
    • Methods for Estimating Lung Volumes

    • Nitrogen washout - the patient exhales fully and breaths 100% oxygen; the exhaled nitrogen concentrations are used to assess lung volumes
    • Helium equilibration - the patient exhales fully and then breaths a combination of oxygen and helium; helium concentrations are used to assess lung volumes
    • Body plethysmography - the patient sits in an airtight room and breaths into a spirometer; the pressures in the room are used to assess lung volumes
    • Lung Volumes

    • ERV 
      Expiratory reserve volume
    • FRC 
      Functional residual capacity
    • IC 
       Inspiratory capacity
    • IRV 
      Inspiratory reserve volume
    • RV 
       Residual volume
    • TLC 
      Total lung capacity
    • VC 
       Vital capacity
    • VT 
       Tidal volume
Last updated on November 15th, 2017
 
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