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Funding Acknowledgements Type of funding sources: None. Background Recovered out-of-hospital cardiac arrest (OHCA) is associated with high morbidity and mortality. Having prognostic tools within the first hours of admission to hospital is critical. The pH is a widespread arterial blood gas marker, but the influence of its respiratory/metabolic components has not yet been established. Purpose The objective of the study is to analyze the utility of first bicarbonate measure as a predictor of in-hospital mortality after OHCA. Methods This is a prospective observational study carried out on survivors to the initial phase of an OHCA, who were admitted to the Acute Cardiovascular Care Unit of our single terciary center. Clinical characteristics and initial blood gas data were analyzed. The primary objective was in-hospital mortality. Results A total of 50 patients were included (2019-2021), of which 40% died during the course of the hospitalization. First pH determination showed significant differences between survivors and dead. Of its two components, the bicarbonate was lower in the patients who died (13.93 ± 3.01 vs. 18.48 ± 4.15, p Conclusions Bicarbonate was the best initial predictor of mortality after an OHCA, above pH, which, although being a good predictor, is potentially altered by PCO2 (which was not a good predictor).