Medical Gas System segmentation by application maps demand to critical-care workflows. Therapeutic use dominates, accounting for roughly 48 % of 2023 global revenue; high-flow oxygen, nitrous oxide analgesia and medical air ventilation are consumed in ICUs, operating rooms and emergency departments where uninterrupted supply affects patient outcomes. Diagnostic imaging represents ~22 %; precise mixtures of helium, xenon and ultra-high-purity compressed air feed MRI, pulmonary-function and blood-gas analysers, so any contamination skews results and liability. Pharmaceutical manufacturing and biotechnology contribute ~18 %; GMP-grade oxygen, nitrogen and carbon dioxide are process inputs for fermenters, lyophilisers and aseptic packaging, linking Medical Gas System market growth to biologics CMO expansion. Other applications—including lab calibration, respiratory therapy home care and veterinary clinics—add the residual 12 %, collectively validating the segment’s role in defining overall market size.