We studied the methods of a heparinized catheter utilization, through intervening nursing staff in charge on drugs administration, in hospitals located in the city of Belo Horizonte, including the concentration of the dilution, the administered volume, the destination of the rest of the solution, the existence of a padronization and the knowledge about the indication and contraindication for the use of this drug. We verified that there is little knowledge concerning the situations in which the utilization of a heparinized catheter is indicated and contraindicated, as well as a lack of a padronization and of a scientific fundament.