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Temperature standardization of multiple spirometers

W S Linn1, J C Solomon, H Gong

  • 1Environmental Health Service, Rancho Los Amigos Medical Center, Downey, CA 90242, USA.

Journal of Occupational and Environmental Medicine
|March 21, 1998
PubMed
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Temperature variations in spirometers can bias respiratory health survey data. Individual thermometer differences, as much as 1.3°C, significantly impact vital capacity measurements, necessitating calibration for accurate results.

Area of Science:

  • Pulmonary Function Testing
  • Biomedical Instrumentation
  • Respiratory Health Surveillance

Background:

  • Spirometer variability can introduce bias in large-scale respiratory health surveys.
  • Temperature fluctuations within spirometers are a potential source of measurement error.

Purpose of the Study:

  • To investigate temperature measurement variability as a cause of spirometer differences.
  • To quantify the impact of thermometer variations on spirometric data.

Main Methods:

  • Six rolling-seal spirometers were used in field and laboratory settings.
  • Internal and external temperatures were recorded using digital thermometers.
  • Data from 3908 students across multiple schools were analyzed.

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Main Results:

  • Internal and external spirometer temperatures showed agreement, lagging room temperature changes.
  • Individual thermometer offsets were consistent between field and lab tests.
  • Thermometer differences up to 1.3°C caused vital capacity measurement variations of up to 0.8%.

Conclusions:

  • Spirometer interior and exterior temperatures do not vary significantly but can differ from ambient air.
  • Individual digital thermometer variations can appreciably bias spirometric data in large surveys.
  • Controlling variations through thermometer selection or calibration is crucial for accurate spirometry.