Within the framework of quality management in medical services, the calibration gains great importance through appropriacy of medical devices. The aim of this study is to investigate the effects of temperature factor to the amount of gas output from the vaporizatör and to enhance the consideration of these factors while adjusting the amount of gas to be given to the patient during the operation. In this study, the performance of the anesthesia vaporizer (isoflurane and sevoflurane) was evaluated and it was investigated whether it the vaporizer supplied the dialed amount of anesthetic to the patient. Then, through changing the temperature of anesthetic device between 20-36°C, the changes in the concentration of isoflurane and sevoflurane gases were measured. In conclusion, it was observed that there is no considerable change on the gas concentration in the 20-36°C temperature range. ©2009 IEEE.