Inclusion Criteria:  18 years and older, Patients with ASA III and below, Under elective general anesthesia, will undergo Open Abdominal Surgery, BMI of 18.5- 29.9 kg/m2, Without neurological, psychiatric, neuromuscular disease, Not addicted to alcohol and drugs, Not mentally retarded, Does not use drugs that will affect thermoregulation such as vasodilators, No history of thyroid disease, Absence of body temperature of 36 0C and 37.5 0C on the morning of the operation, No complication developed during the surgical intervention and no blood transfusion was performed.  Exclusion Criteria:  Refusal to participate in the research Complication developed during the operation