Calibration, QC and settings | Technical aspects | Standardisation of test performance | Reporting |
Check ambient conditions Perform three flow volume calibrations of sensor e.g. pneumotach Perform leak time verification and time constant Perform pressure sensor verification Perform BIO QC to check normal values Review system settings for shutter time and calculation of RV and TLC Quarterly perform isothermal calibration as part of the QA programme (known volume/resistance method) | Ensure adequate thermal equilibration Check internal speaker is working and communication with patient is clear Ensure mouthpiece is an appropriate size and fit for the patient and adjust the arm to the most comfortable position for patients upright sitting position Ensure there is a filter and nose peg available System has been calibrated successfully Operator understands the technical aspects of the tests | Test performance as per international and national recommendations Enter patient demographic data into system software Consider patient limitations Explain the purpose of the test and most suitable method Check sitting position, position of sensor mounting arm and that patient can hold their cheeks Close the door and explain the test again during thermal equilibrium Perform linked or separated manoeuvre: Airways resistance TGV VC manoeuvre | Airways resistance should be a uniform overlapping shape of consistent breaths Report median breath from median trial Report sReff TGV should occur at the end of a tidal breath ERV should be reproducible VC should be consistent with largest recorded Minimum three technically acceptable manoeuvres within 5% variation |
QC: quality control; sReff: effective specific airways resistance; TGV: thoracic gas volume; ERV: expiratory reserve volume; VC: vital capacity; BIO QC: biological quality control; RV: residual volume; TLC: total lung capacity; QA: quality assurance.