Question

The following results are obtained from a calibration study with the slow depression of 3.0-liter super syringe in a pulmonary function lab.

1st calibration 2nd calibration 3rd calibration
2.92 L 2.83 L 2.80 L
What should the respiratory therapist recommend?
1) Proceed with patient testing.
2) Check the system for leaks.
3) Replace the super syringe.
4) Repeat the calibration using a rapid, consistent depression of the syringe.

Answer 1

The respiratory therapist should recommend checking the pulmonary function testing system for leaks and repeating the calibration. If issues persist, replacing the super syringe might be necessary.

Step-by-step explanation:

The results from a pulmonary function calibration study using a 3.0-liter super syringe show declining volumes across three consecutive calibrations (2.92 L, 2.83 L, and 2.80 L). This trend suggests a potential problem, since the expected volume should be consistently close to the syringe's nominal volume of 3.0 liters. The decrement in measured volumes is an indication that the system might not be sealing properly or the syringe may be malfunctioning.

Given these results, the respiratory therapist should check the system for leaks to ensure accuracy and functionality of the testing equipment before proceeding with patient testing. If no leaks are found, it may then be advisable to repeat the calibration to verify the initial results or consider the possibility of needing to replace the super syringe if it is found to be defective.