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Ayşe Belin Özer,1 Aysun Yildiz Altun,1 Ömer Lütfi Erhan,1 Tuba Çatak,2 Ümit Karatepe,1 İsmail Demirel,1 Gonca Çağlar Toprak3 1Department of Anesthesiology and Intensive Care, Firat University Medical School, Elaziğ, 2Department of Anesthesiology and Intensive Care Clinic, Bingol State Hospital, Bingöl, 3Department of Anesthesiology and Intensive Care Clinic, Elazig Training and Research Hospital, Elaziğ, Turkey Purpose: We evaluated the effects of body mass index (BMI) on thermoregulation in obese patients scheduled to undergo laparoscopic abdominal surgery. Methods: Sixty patients scheduled to undergo laparoscopic abdominal surgery with no premedication were included in the study. The patients were classified into 4 groups according to BMI 50. Anesthesia was provided with routine techniques. Tympanic and peripheral temperatures were recorded every 5 minutes starting with the induction of anesthesia. The mean skin temperature (MST), mean body temperature (MBT), vasoconstriction time, and vasoconstriction threshold that triggers core warming were calculated with the following formulas: MST = 0.3 (Tchest + Tarm) + 0.2 (Tthigh + Tcalf). MBT was calculated using the equation 0.64Tcore+0.36Tskin, and vasoconstriction was determined by calculating Tforearm-Tfinger. Results: There was no significant difference between the groups in terms of age, gender, duration of operation, and room temperature. Compared to those with BMI 50 in the 5th, 10th, 15th, 20th, 25th, 30th, 50th, and 55th minutes were less than those with BMI