Standardisation of the single-breath determination of carbon monoxide uptake in the lung

This joint statement is based on the previous statements from the American Thoracic Society (ATS) and the European Respiratory Society (ERS), and much of the material was taken from these statements. Although there are other ways to measure carbon monoxide (CO) uptake (e.g. steady-state, intra-breath and rebreathing techniques), recommendations are restricted to the single-breath technique, since this is the most common methodology in use around the world.