Grzych, Guillaume and Lee, Graham R and Alpdemir, Medine and Gernez, Emeline and Anseeuw, Kurt and Bjorke-Monsen, Anne-Lise and Croes, Kathleen and El-Khoury, Joe M and Hamzic, Jasmin and Noyce, Alastair J and Stankovic, Sanja and Rolland, Benjamin and Bramness, Jorgen and Vermeersch, Pieter and Cavalier, Etienne (2025) Addressing the silent epidemic of recreational nitrous oxide use: a position, call to action and recommendations by the European Federation of Clinical Chemistry and Laboratory Medicine Committee on Biological Markers of Nitrous Oxide Abuse. Clinical Chemistry and Laboratory Medicine, Early online, https://doi.org/10.1515/cclm-2025-1060.