The aim of this study was to evaluate procalcitonin (PCT) levels in the predicting of bloodstream infections in a large population of patients with positive blood cultures (BC) in the unit care of Avicenna military hospital of Marrakech. Material and Methods: This prospective study was carried out using clinical and routine laboratory data collected at the Clinical Microbiology and biochemistry from laboratory of Avicenna military hospital – Marrakech, Morocco, between January 2019 and December 2021. Results: 109 cases were collected from laboratory data of Avicenna military hospital in Marrakech. Most of patient were male with 79 cases (72.5%), blood cultures were positive in all cases. Procalcitonin were positive in the majority of patients with a 105 cases (96%). Klebsiella sp. was the most frequent germ in gram negative bacilli with a rate of 25 cases (23%) Coagulase-negative Staphylococcus was the most frequent germ in gram-positive cocci with a rate of 23 cases (21%).