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Abstract This study was conducted on forty patients submitted for tonsiliectOluy and / or adenoidectomy. The patients were classified into four groups, ten patients each. The groups (l), (2), (3) and (4) were fasted preoperatively 12 , 8, 6, and 4 hours respectively. The patients were subjected to preoperative clinical examinations and laboratory investigations to exclude other coexisting diseases. All patients were premedicated with atropine sulphate 0.02 mg/kg and anaesthesia was induced by thiopentone sodium 4 mg/kg , suxamethonium 1 mg/kg to facilitate nasotracheal intubation and maintained by N20 600/0 in oxygen 40% and halothane which was titrated according to the patients needs with spontaneous ventillation. No preoperative drug medication nor intraoperative fluids were given to the children. Monitoring included the heart rate, oxygen saturation and end tidal carbon dioxide. The data obtained from this study were analysed statistically. There was a significant decrease in preinduction serum glucose concentration as cornpared to basal concentration and significant Increase in postoperative serum glucose |