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ARTP Spirometry – Position on GLI Global Predicted Equations
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ARTP Spirometry – Position on GLI Global Predicted Equations

23 October 2025

The ARTP has recently issued a position statement on the adoption of “race-neutral” GLI Global predictive equations for spirometry. Adopting the GLI Global equations supports equity in respiratory diagnostics and aligns UK practice with international best standards. The statement is also endorsed by ARNS.
 
This guidance is intended to simplify practice for healthcare professionals performing and reporting spirometry by removing the need to apply different predicted equations for different populations.
 
Most spirometers that meet ISO Technical Standard 26782 already have the GLI Global equations available built into their software. However availability may depend on the age of the spirometer and the service agreement in place. We recommend that healthcare providers contact their manufacturer to confirm what options are available.
 
For healthcare providers using spirometers that do not meet ISO 26782, it is strongly recommended that new compliant devices are purchased.
 
Where spirometers meet the technical standard but do not yet have the GLI Global equations available, selecting GLI ‘Other’ category is an acceptable alternative until updates become more widely available.
 
Where there are concerns regarding longitudinal data, including the recalculation of previous results, it will be important to also provide the absolute values for comparison. These can be used to assess if there has been any significant change in lung function parameters. It is also important to remember that spirometry is only part of the diagnostic and management pathway.
 
This position statement does not affect candidates currently undertaking spirometry certification. Candidates should continue to collect evidence and prepare for their OSCE as normal. Any future changes to the spirometry certification process will be communicated widely. The next edition of the ARTP spirometry newsletter will include some discussion around this topic. There is a plan to run a webinar in the future as well.
 
Colleagues in primary care who have questions about the implications of this position statement are encouraged to contact their local hospital lung function department which may be able to offer guidance support, or spirometry training providers. Healthcare professionals listed on the ARTP Spirometry Register also have access to a clinical expert via the spirometry portal, who can provide advice and guidance on next steps.

Click here to download the position statement

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