The patented, digital Flow-Volume Calibrator® is the only portable means of calibrating and validating both flow and volume measurements of pulmonary function testing devices. Pulmonary labs worldwide rely on the Flow-Volume Calibrator® to provide the most complete picture of their pulmonary device accuracy.
A multiyear longitudinal study utilized multiple Jones Flow-Volume Calibrators to perform daily calibration checks on spirometers in a lung function testing system for a study of air pollution exposure in several thousand southern California school children.
The Flow-Volume Calibrators were utilized 3-times each day to monitor the FVC, FEV1 and FEF 25-75 accuracy of the field spirometers. Note: the spirometers utilized in the study were not Jones Medical spirometers.
Outcome: After thousands of tests with the Flow-Volume Calibrators, it was determined that they were the most stable component of the entire lung function testing system (with a total volume variance of only 1%). The authors stated “Our major unanticipated finding was the high precision of syringe volume readouts, which allowed us to use these instruments as a “gold standard” for detecting small variations in spirometer readouts. We thereby improved the precision of lung function measurements as compared with measurements made with spirometers alone or with nonelectronic calibration syringes.”
Air “flow” is the determining factor in the diagnosis of today’s two most predominant respiratory diseases; asthma and COPD. Yet, standard spirometry calibration syringes can only accurately validate for volume! Recognizing this, the American Thoracic Society and the Social Security Disability standards now recommend checking spirometric linearity and flow rate accuracy by varying injection times of a standard 3-liter volumetric syringe at three different rates; 0.5 seconds, 6 seconds, and somewhere in between. Although this is an improvement over previous recommendations, it is an inaccurate and time-consuming approach requiring a stopwatch. As a consequence, very few people follow these recommendations.
The digital Flow-Volume Calibrator® surpasses these requirements by providing the ability to validate not only the FVC parameter, but also the FEV1, FEF 25-75, PEFR and instantaneous expiratory flow rates (FEF25, FEF50, and FEF75), as well as the FIVC. You can now verify the flow rate accuracy of your pulmonary function device from zero to twelve liters per second anywhere in the volumetric range of zero to three liters in digital increments of 1.5 milliliters!