Medical irradiation (and costs) can be drastically reduced, which is of critical interest in neonates and young women. The Lung Ultrasound in the Critically Ill Favoring Limitation of Radiation (LUCIFLR) project aims to limit, not eradicate, one-third of urgent bedside radiographs and two-thirds of urgent CT scans in the next three decades,77 which can be considered a reasonable target. The LUCIFLR project does not require independent confirmatory studies. Bedside radiography has demonstrated an inaccurate sensitivity for most life-threatening disorders. With a roughly 60% to 70% sensitivity, it appears to be a suboptimal tool in critical care.78,79 Urgent CT imaging offers a strong overview yet at the cost of severe drawbacks (need for transportation, anaphylaxis, etc).80,81 Lung ultrasound has proven to be a quite similar diagnostic tool in most cases47‐50,57 and sometimes superior, particularly with better detection of pleural septations,77 necrosis within consolidations,82 real-time assessment of lung sliding with no bedside equivalent,57 dynamic air bronchograms,83 and diaphragmatic analysis.29,41 Ultrasound provides quantitative data for all disorders (as shown in the figure legends in this article) and helps to quantify pleural effusions,15,19,61 and monitor lung consolidation, which are of interest for intensivists who use positive end-expiratory pressure for lung recruitment.32 Pneumothorax volumes are indicated by the lung point location.26,39,50 For these reasons, lung ultrasound should be considered a reasonable bedside gold standard. Each time that the clinical question is focused (ie, pneumothorax or not) and irradiating tests are avoided, not in theory but while practically using ultrasound, physicians take part, aware or not, in the LUCIFLR project.