Abstract: Insufflation gas is introduced into a body cavity to be inflated. The gas flow is stopped, and the pressure in the body cavity is measured at plural, discrete intervals of time. Pressure reading values are stored in memory for a predetermined number n of the most recent pressure reading values. These stored pressure reading values are compared to one another to determine the pressure differential between the highest and lowest pressure values. New pressure readings are continually made at the time intervals, and the new pressure reading values replace the oldest pressure readings such that the most recent pressure reading values are stored in memory. Pressure measurements are continued if the maximum pressure differential in the predetermined number n of the most recent stored pressure reading values is less than the predetermined pressure differential.