A fluid delivery system and method for measuring flow at a patient utilizing a differential force sensor in order to precisely control the flow of fluid at very low flow rates. The system includes a fluid line through which a fluid is conveyed to the patient, and a flow controller that selectively varies a rate of flow of the fluid through the fluid line. The differential force sensor can be mounted very close to a point of entry of the fluid into the patients body. An onboard communications device is controllably coupled to the flow controller and to the force sensor, responds to an output signal, and provides a feedback to the flow controller in a closed-loop process. The system can pump the fluid at a higher frequency until the flow rate is actually reached at the patient and then adjust to the flow rate needed to ensure patient health.
