When does Epic begin calculating volume on a new infusion order?

Epic begins calculating volume on a new infusion order when the new bag is documented on the Medication Administration Record (MAR). This timing is crucial because it is at this point that the system recognizes an active infusion order and can track the volume to be administered based on the specific parameters of that order. Documenting the new bag ensures that the system has accurate information regarding the infusion, including the volume contained within the bag and other relevant details like the start time of the infusion. This data allows for effective monitoring of the patient's treatment and helps healthcare providers manage dosage accurately throughout the infusion period.

The other options do not trigger the calculation of volume. For instance, simply introducing the patient does not correlate with the initiation of an infusion order. Setting an infusion rate is necessary for management, but it does not, by itself, initiate volume calculations. Recording baseline vitals, while important for patient assessment, is unrelated to the infusion volume calculation process.