Abstract
The calibration syringe is probably the most important instrument in pulmonary function laboratories, yet no validation results have been published.
Methods: We weighed a 3 L calibration syringe before and after emptying it of water and determined the corresponding volume of gas by using a modified rolling seal spirometer.
Results: The volume of a spirometer calibration syringe could be verified with an accuracy of ± 15 mL. All syringes larger than one litre had volumes within the label claimed volume ± 0.5 %.
Conclusion: Spirometer calibration syringes have a stable stroke volumes. The maximal interval between syringe validations should perhaps be extended beyond the 1-year period required by current standards. Use of two syringes would allow one syringe exceeding the maximal permissible error to be detected earlier.
- © 2012 ERS