This article presents a study case focused on the establishment and improvement of the service level in a central warehouse of a hospital organization in Colombia which provide the products of medical use, clothing, anesthetics, and supplies, to nineteen medical dependencies. The warehouse is managed by a person, developing planning processes, purchases, reception, and administration of products or inventories who depends on the administrative and financial sub-direction of the institution. Through the use of interviews and surveys conducted at different dependencies. As well as the collection of information in the field, there were problems with the availability of products due to problems related to planning purchases which are done empirically without data analysis. Taking into account the problematic previously raised, we took different models of predictions as well as the use of the Mean Squared Error (MSE) and the accuracy of predictions to determine the best model according to with the product analyzed.