of the cases are performed under high gas flow even with the available high tech machine and gas monitoring. Unfamiliarity with low flow anaesthesia and fear of life-threatening sequalae to patients are the causes for reluctance to use low gas flow. To review the advantages and claimed disadvantages in low flow anaesthesia, we conducted this study under the quality assurance program. This prospective randomized study uses two different low flow fresh gas flow techniques 1.5 and 1.0 lit / min. Fifty-four patients (ASA 1 & 2) undergoing elective surgical procedures were randomly allocated into two groups A & B of 27 patients each. Group A received 1.5 lit / min (oxygen 0.5 lit and nitrous oxide 1.0 lit) while group B received 1.0 lit / min (oxygen 0.5 lit and nitrous oxide 0.5 lit). Gas and volatile variables were analyzed via the gas analyzer and arterial blood gases. There was no significant difference in gas analyzer monitoring and arterial blood gases in both groups. Thus our study concluded and suggested the use of 1 liter (0.5 lit oxygen / 0.5 lit nitrous oxide) low flow technique in operations of intermediate and long duration with the availability of high tech anaesthetic machines and gas analyzers rather than 1.5 lit / minute thereby further reducing the cost expended on gases and volatile agents as well as minimizing operating room pollution and its consequent health hazard.