- 3 technically acceptable results selected from up to 8 efforts.
- Repeatability criteria are met when there is no more than 100mls (and certainly no more than 150mls in the occasional highly variable patient) between each blow when value is above 2L. Use 5% variability when value is below 2L
- Choose the highest FEV1, VC and FVC from 3 efforts meeting repeatability criteria
Selecting the best value for clinical use
The RVC should be measured and recorded, as well as the FVC. The ratio (FEV1/VC) should be calculated using whichever is the higher of the VC measurements (RVC or FVC). Both the flow-volume and volume-time graphs should be documented.
Spirometry reporting across healthcare communities should be provided in an agreed and uniform manner, ideally involving use of FEV1, FVC and VC and using data highlighting lower limit of normal values, %pred and SR’s.
Mark as Understood
