The developed investigation in this type of case study, had as main goal to measure the nursing personnel at a university hospital. The adopted methodology comprizes the identification of some specific variables, among them the patient classification according to the nursing care category and the index of the predicted and not predicted absences. The medical clinic admission and surgical units were studied. Results demonstrated that the current nursing personnel corresponds to 50% of what was expected, whereas the nursing aides personnel has shown an overage of 29.2%. The redefinition of the nurses quantitative in the hospital will create possibilities to reorganize the work with the minimization of the working load, in such a way to assure the quality of delivered nursing care.