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Objective:To compare the amounts of any clinically detectable gas passage into the urinary bag in laparoscopic and open surgeries.Methods:Seventy-nine women were allocated into two surgical groups;Group1: carbon dioxide(CO2) laparoscopy(n=37) andGroup2: gasless laparoscopy or laparotomy(n=42).All patients had urinary catheter during the surgeries.After checking the tightness of the connection of the urinary catheter and bag operations were performed.At the end of each surgery the urine volumes were recorded.The bags were immersed into a water containing container with a volume scale.The volume rise of the container was recorded.The valve of the outlet of the bag was ted on under the water and any leakage of air bubbles was observed.The final volume of the container was recorded once again while the bag was still in the water.The two groups were compared by using theStudent’storMannWhitney U tests.Results:We did not observe and hence measure any gas accumulation in the urine bags of both groups.The women’s ages, total intraoperative urine volume, urine production rate and total operative times of the groups were not significantly different.The mean operative time was (82.98±62.14) min in open surgeries and(73.46±52.74) minutes inCO2 laparoscopic surgeries.The difference between the groups was not significant(P=0.468).Conclusions:Any gas accumulation in the urine bag duringCO2 laparoscopic surgery should raise the suspicion of urinary tract injury.Urinary catheterization helps to diagnose the unnoticed bladder injuries.