<prompt> Nitrogen to caloric ratio in total parenteral nutrition is:1 gm of N2: 150 non protein calories1 gm of N2: 100 non protein calories1.25 gm of N2: 100 non protein calories1.25 gm of K: 150 non protein calories  <response>: Parenteral formulas usually deliver 75-150 non protein carbohydrate kcal per gram of nitrogen infused, a ratio that maximizes carbohydrate and protein assimilation and minimizes metabolic complications aminoaciduria, hyperglycemia, and hepatic glycogenesis. Ref: Barbour J.R., Barbour E.F., Herrmann V.M. 2010. Chapter 10. Surgical Metabolism Nutrition. In G.M. Dohey Ed, CURRENT Diagnosis Treatment: Surgery, 13e. 