Another pharmacist checked the work and product labels that were printed for preparation of the TPN, but she did not notice the error involving the erroneous change from mcg to mg. A pharmacy technician prepared the TPN using a 500-mL bag. The technician had to replenish the compounder syringe that contained zinc 11 times while preparing the solution, which required dozens of vials of zinc sulfate. Several TPN additives had to be added manually, which the technician prepared and brought to a third pharmacist to check before adding them to the solution. The final TPN bag was then dispensed to the neonatal intensive care unit (NICU).