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Background: Our objective is to analyze whether the combination of C-reactive protein (CRP), procalcitonin (PCT), presepsin or SCD14-ST and mid-regional pro-adrenomedullin (MR-proADM) measured in the first 24 h from ICU admission allowing a better management of septic patients (diagnostic and prognostic) both in severe sepsis (SS) and septic shock (SSh)., Methods: Cohort study of 388 patients admitted in the ICU during 12 months of whom 142 were controls. Biomarkers were measured through immunoluminometric assays in samples of serum or plasma within the first 24 h after admission. Data were evaluated with non-parametric statistics bivariant, ROC curve analysis for diagnostic evaluation and multivariate analyses for survival analysis., Results: In the analyzed cohort, 61.8% of patients were males, mean age: 63 years range (18-90) and 67.8% in controls mean age: 63 years, range (39-91). PCT showed the highest area under the curve (AUC) (0.989) as compared with the rest of biomarkers (p<0.01). PCT also enabled the difference between Gram-positive or Gram-negative bacteria to be determined. The AUCs for CRP (0.922) and presepsin (0.948) showed a similar diagnostic value. In cases of SSh, the AUC of presepsin experienced a noticeable increase (p<0.0001). MR-proADM showed a better prognostic value (p=0.00022) particularly in cases of SSh (p=0.00001) increasing along with the APACHE-II score., Conclusions: PCT, MR-proADM and presepsin are complementary markers that could be of great help in the management of septic patients when they are measured in the first 24 h after ICU admission.