Once you have decided the enteral vs parenteral and peripheral vs central questions you are ready to order the TPN. You should follow an orderly sequence of calculating TPN components when doing this: establish fluid goals establish protein and caloric goals calculate CHO and lipid concentrations determine electrolyte requirements determine vitamin/mineral requirements consider other additives After the final calculations, you should order appropriate initial laboratory assessment and ongoing monitoring parameters. Finally, consult the pediatric dietitian for help and guidance.