Abstract: An arrangement and method for more accurately detecting well bore fluid kicks and/or losses by coupling a fluid flow measurement device to a substantially vertical tubular, such as a bell nipple or marine riser, to more accurately determine the flow rate of fluid flowing out of the well bore. Well bore fluid kicks and/or fluid losses are preferably detected by comparing the determined flow rate of fluid flowing out of the well bore and the flow rate of fluid injected into the well bore for any difference indicative of a well bore fluid kick or loss event.