Reproducibility of lung volume measurements

Area of Science:

• Pulmonary Function Testing
• Medical Instrumentation
• Biomedical Engineering

Background:

• Test reproducibility is vital for interpreting results and guiding data collection.
• Reproducibility criteria vary based on subject groups, instruments, and procedures.
• Within-subject variability for lung volumes and measurement techniques should ideally be established per laboratory and subject group.

Purpose of the Study:

• To emphasize the importance of establishing and monitoring test reproducibility in physiological measurements.
• To provide recommendations for defining and implementing reproducibility criteria in laboratory settings.
• To highlight the need for laboratory-specific quality control for accurate data.

Main Methods:

• Monitoring and controlling test reproducibility as a minimum requirement.
• Defining between-day reproducibility using reference subjects and periodic measurements.
• Establishing laboratory-specific quality control programs.

Main Results:

• Reproducibility criteria are dependent on subject groups, instruments, and procedures.
• Within-subject variability needs to be established for each laboratory and subject group.
• Periodic quality control measurements are recommended for monitoring reproducibility.

Conclusions:

• Test reproducibility is a critical factor in result interpretation and data collection.
• Laboratory-specific criteria and ongoing quality control are necessary for reliable measurements.
• Multiple determinations and defined reproducibility criteria are justified for measurements like functional residual capacity (FRC)pleth.