Objective: To investigate the code blue application at a training and research hospital in Turkey.Methods: The code blue declaration forms and the hospital database with 238 complete records between January 2016 and July 2017 were collected. The form involved individual characteristics, the reason for issuing the code blue call, the unit and block where the code was given, time and location related properties such as working time and arrival duration, properties regarding the intervention process such as its type, duration or result. The 24-hour and 30-day long survival data of the patients to whom cardiopulmonary resuscitation was implemented were obtained from the hospital database, or from their relatives. The influencing factors of arrival duration were analyzed.Results: The median duration of arrival was 2.14 (2.00-3.02) min. Code blue applications were performed more frequently in Departments of General Surgery, Internal Medicine, Orthopaedics, and Cardiology Clinics. Half of the code blue calls were due to cardiac arrest; the other half was due to shortness of breath or respiratory distress, syncope, and respiratory arrest. Three-out- of four code blue calls were treated with orotracheal intubation and cardiopulmonary resuscitation, or only orotracheal intubation or only medical treatment; one-fourth of the calls were not intervened. Altogether, 72.36% of the code blue calls patients were intervened; 69.35% of them were made both orotracheal intubation and cardiopulmonary resuscitation, and 20.5% of them were made only orotracheal intubation and 10.55% of them made only medical treatment. It was found that giving the code blue day or night had no effect on the time to reach the area where the code was given. Similarly, it was found that giving the code blue within daytime or night shift had no effect on the time to reach the area where the code was given. (P>0.05). The survival rates were 39.1% within the first 24 h and 18.1% within the first 30 d.Conclusions: Applications of code blue should be analyzed at regular intervals as clinical quality indicators. Reasons for wrong calls should be determined. The duration of reaching locations where calls are made should also be decreased.