A method of using an IV assembly with an electronic system to fill the IV assembly with therapeutic medical fluid for a patient, the method comprising: obtaining an IV assembly comprising: an empty IV bag with an outlet on a lower side; a tubing with an upper end and a lower end, the tubing being permanently attached in fluid communication with the IV bag, the tubing being sufficiently long to be capable of extending from the outlet on the lower side of the IV bag when the IV assembly is attached to a pole stand to an access point in an IV tube attached to the arm of a patient in a lying position; and a closeable male luer connector with a first end and a second end, the first end of the closeable male luer connector being permanently attached in fluid communication with the tubing, the closeable male luer connector comprising an open position and a closed position for sealing fluid within the IV assembly; connecting the IV assembly to an electronic system for filling IV bags, connecting the IV assembly comprising attaching the closeable male luer connector to the electronic system; and filling the IV bag by pushing fluid up through the closeable male luer connector, through the tubing, and into the IV bag, without requiring assembly or attachment of any of the IV bag, tubing, or closeable male luer connector to each other, thereby providing a closed, primed IV assembly that is ready to connect to an access point in an IV tube attached to a patient. obtaining an IV assembly comprising: an empty IV bag with an outlet on a lower side; a tubing with an upper end and a lower end, the tubing being permanently attached in fluid communication with the IV bag, the tubing being sufficiently long to be capable of extending from the outlet on the lower side of the IV bag when the IV assembly is attached to a pole stand to an access point in an IV tube attached to the arm of a patient in a lying position; and a closeable male luer connector with a first end and a second end, the first end of the closeable male luer connector being permanently attached in fluid communication with the tubing, the closeable male luer connector comprising an open position and a closed position for sealing fluid within the IV assembly; an empty IV bag with an outlet on a lower side; a tubing with an upper end and a lower end, the tubing being permanently attached in fluid communication with the IV bag, the tubing being sufficiently long to be capable of extending from the outlet on the lower side of the IV bag when the IV assembly is attached to a pole stand to an access point in an IV tube attached to the arm of a patient in a lying position; and a closeable male luer connector with a first end and a second end, the first end of the closeable male luer connector being permanently attached in fluid communication with the tubing, the closeable male luer connector comprising an open position and a closed position for sealing fluid within the IV assembly; connecting the IV assembly to an electronic system for filling IV bags, connecting the IV assembly comprising attaching the closeable male luer connector to the electronic system; and filling the IV bag by pushing fluid up through the closeable male luer connector, through the tubing, and into the IV bag, without requiring assembly or attachment of any of the IV bag, tubing, or closeable male luer connector to each other, thereby providing a closed, primed IV assembly that is ready to connect to an access point in an IV tube attached to a patient.