The 2026 ATS/ERS guidelines require gas analyser linearity to stay within 0.5% of the full-scale reading. This update is more stringent than previous standards to improve the reproducibility of DLCO measurements across different labs. When conducting a gas analyser comparison, look for systems that provide automated linearity verification logs. These logs prove your equipment meets the 0.5% threshold during annual inspections and help maintain your facility’s clinical accreditation and reputation for excellence.