Parenteral Protein Calculator procedure algorithm. PPC initially determines the total protein target (A) and concurrent enteral protein (B). Parenteral protein is then calculated and displayed (C). DOL= Day of life, eV= Enteral volume, BW= Birth weight, FC= Concentration of protein in formula (gram/mL), TP= Total protein intake (gram/Kg/day), eP= Protein intake from enteral route (gram/Kg/day), sP= Suggested parenteral protein (gram/Kg/day).