A flow regulator device and an associated method of using the device to constrict the flow of fluid through an intravenous line is disclosed. The device comprises a first component pivotally attached to a second component by a hinge. The first and second components are coupleable together into a closed book-like position for enshrouding an intravenous transfer line within a cylindrical tubing channel traversing along the device. A semi-elliptical pinch-off wheel is attached to the device so that the enshrouded transfer line may be progressively pinched off by the semi-elliptical pinch-off wheel in order to variably restrict the flow of liquid through the transfer line. A crossbar having an indicating end is attached to the wheel for indicating the flow rate through the enshrouded and constricted transfer line. The method of using comprises the steps of adjusting, attaching, hanging, injecting, noting, obtaining, placing, pushing, recording, rotating, securing, sterilizing, turning, and twisting.
