ABSTRACT: The benefit of any specific target range of blood glucose (BG) for post-cardiac arrest (PCA) care remains unknown.We conducted a multicenter retrospective study of prospectively collected data of all cardiac arrest patients admitted to the ICUs between 2014 and 2015. The main exposure was BG metrics during the first 24?hours, including time-weighted mean (TWM) BG, mean BG, admission BG and proportion of time spent in 4 BG ranges (<=?70?mg/dL, 70-140?mg/dL, 140-180?mg/dL and > 180?mg/dL). The primary outcome was hospital mortality. Multivariable logistic regression, Cox proportion hazard models and generalized estimating equation (GEE) models were built to evaluate the association between the different kinds of BG and hospital mortality.2,028 PCA patients from 144 ICUs were included. 14,118 BG measurements during the first 24?hours were extracted. According to TWM-BG, 9 (0%) were classified into the <=?70?mg/dL range, 693 (34%) into the 70 to 140?mg/dL range, 603 (30%) into the 140 to 180?mg/dL range, and 723 (36%) into the >?180?mg/dL range. Compared with BG 70 to 140?mg/dL range, BG 140 to 180?mg/dL range and >?180?mg/dL range were associated with higher hospital mortality probability. Proportion of time spent in the 70 to 140?mg/dL range was associated with good outcome (odds ratio 0.984, CI [0.970, 0.998], P =?.022, for per 5% increase in time), and >?180?mg/dL range with poor outcome (odds ratio 1.019, CI [1.009, 1.028], P< .001, for per 5% increase in time). Results of the 3 kinds of statistical models were consistent.The proportion of time spent in BG range 70 to 140?mg/dL is strongly associated with increased hospital survival in PCA patients. Hyperglycemia (> 180?mg/dL) is common in PCA patients and is associated with increased hospital mortality.