RPFT Equipment Calibration & Quality Control Flashcards

How often should a 3-liter calibration syringe be used to verify spirometer volume accuracy?

Answer: At least once daily before testing

ATS/ERS guidelines require volume calibration verification with a 3-liter syringe at least once each day testing is performed.

What is the acceptable volume accuracy range for a spirometer calibration check using a 3-liter syringe?

Answer: Within ±3.5% or 65 mL

ATS/ERS standards require the measured volume to be within ±3.5% of the known syringe volume (±105 mL for a 3-L syringe).

Which biological control method is used to track long-term spirometer performance trends in a PFT lab?

Answer: Testing a stable staff member and plotting control charts

Biologic controls involve repeated testing of a healthy, stable staff member whose values are charted over time to detect equipment drift.

What does a linearity check of a spirometer assess?

Answer: Accuracy across the entire volume range, not just at 3 liters

Linearity testing verifies that the spirometer reads accurately at low, mid, and high volumes, ensuring consistent performance across the full range.

When should a body plethysmograph undergo leak testing?

Answer: Daily before patient testing

Body plethysmograph leak checks should be performed daily, because even small leaks can significantly alter pressure measurements and falsify lung volume results.

Which gas is used as the reference for the thermal conductivity detector in a helium dilution FRC measurement system?

Answer: Helium

The thermal conductivity detector measures helium concentration because helium has a uniquely high thermal conductivity that is easily distinguished from other respiratory gases.