Abstract: A pumping apparatus for administering fluids to a patient. The pump apparatus includes a pump, a controller, and a user interface operatively connected to the controller having a plurality of push buttons for providing inputs to the controller when the push buttons are depressed in an unlock state of the pump. At least some of the inputs are capable of causing the controller to change operation of the pump. At least one of the plurality of push buttons has multiple functionality and is operable when depressed and released in the unlock state of the pump to provide an input for use in affecting the operation of the controller. The one push button is operable when depressed and held in a depressed position for a predetermined time interval in the unlock state of the pump to initiate a lockout state of the pump.