Letter to the Editor: Chest X-ray-based severity scores in COVID-19 - what do they tell us about oxygen needs?

The coronavirus disease 2019 (COVID-19) pandemic placed unprecedented strain on emergency departments (ED), demanding rapid, reliable, and widely accessible tools to guide early clinical decision-making. While computed tomography offers high sensitivity for detecting pulmonary involvement, its routine use is limited by cost, logistics, and patient volume. In this context, chest radiography despite its lower sensitivity regains relevance when combined with structured severity scoring systems. Mohammed et al published a study in the World Journal of Critical Care Medicine provides timely and pragmatic evidence on the clinical utility of two established chest X-ray-based scores, the Radiographic Assessment of Lung Edema and the BRIXIA score, in predicting oxygen support requirements in COVID-19 patients. By correlating radiographic severity with the need for escalating oxygen delivery devices, the authors demonstrate that higher scores reliably identify patients likely to require advanced respiratory support in the ED. Importantly, the study highlights that these scores perform best in predicting higher levels of support, rather than excluding mild disease, underscoring their value in triage and resource allocation. A notable strength of this work is the rigorous assessment of inter- and intra-rater reliability following structured clinician training, confirming that both scores can be applied consistently across specialties. Although predictive accuracy diminishes later during hospitalization reflecting the multifactorial nature of clinical deterioration, the findings reinforce chest radiography as a rapid, low-cost, and globally available prognostic tool. This letter underscores how standardized chest X-ray scorings can meaningfully inform frontline decisions during respiratory pandemics and beyond.