<prompt> Gas most commonly used in laparoscopy isCO2SO2N2O2  <response>: Ans. is a i.e. CO2 CO2 is the gas used to create pneumoperitoneum during laparoscopy. Other option is N20. But it is expensive, less soluble in blood and suppos combustion. Also know : Instrument used for creating pneumoperitoneum is veress needle. Flow Rate of CO2 for creating pneumoperitoneum 200 -- 2000 mlmin and pressure between 15 -- 25 mm of Hg. 