Sepsis remains a major challenge in clinical practice with considerable morbidity and mortality despite modern treatments. Clinicians need good diagnostic and prognostic markers to identify infected patients who would rapidly benefit from prompt, empirical antibiotic therapy and other supportive treatment. to comparison of Presepsin (CD14), Procalcitonin (PCT) and C- reactive protein (CRP) at different SOFA and APACHE II scores in sepsis patients. A prospective cohort observational study was conducted in Critical Care Medicine Department, Faculty of medicine, Cairo University, Egypt recruiting admitted adult critically ill patients diagnosed. All subjects were recruited during the period from December 2013 to November 2015. All subjects were subjected to complete history taking, clinical examination, Complete blood count, Kidney and Liver function, Coagulation profiles, blood, urine, and sputum cultures ± wound or drain culture, presepsin, PCT and CRP plasma concentrations. Mean age of our study group was 49.8±16.05 years and mean APACHE II score 14±4.4 with mean length of ICU stay was 13.6±7.06 days.There was significantly higher frequency of DM and HTN in Non- survivors group than Survivors.SOFA score was significantly higher at all assessments in Non- survivors as compared to survivors on admission and at day 1, 3,7 and 15.