Chapter 18 Nutrition Support

BOX 18.6 Worksheet for Determining Parenteral Nutrition Prescriptiona A. Calculate energy and protein content given final concentrations and volume. Example: D25

AA4.25 L3.0 @ 2,400 mL/d 1. Record concentration of dextrose, amino acids, and lipids in solution (below).

2. Calculate grams of dextrose, amino acids, and lipids by multiplying concentration by volume of solution in liters (× 10). _____% dextrose

_____% amino acids _____% lipids

× × ×

______ L × 10 = _______ g dextrose ______ L × 10 = _______ g amino acids ______ L × 10 = _______ g lipids

3. Calculate energy from dextrose, amino acids, and lipids by multiplying grams by kilocalories per gram. _____ g dextrose

_____ g amino acids _____ g lipids

× × ×

3.4 kcal/g 4 kcal/g 9 kcal/g

= ________ kcal = ________ kcal = ________ kcal

4. Add kilocalories from dextrose, amino acids, and lipids (from #3) to determine total energy. ______total kcal

B. Calculate energy and protein content given volume of base solution. Example: 357 mL D70

, 1,200 mL AA10 , 250 mL L20

1. Convert volume of dextrose, amino acids, and lipids to liters by dividing volume in milliliters by 1,000. ______ mL dextrose/1,000

______ mL amino acids/1,000 ______ mL lipids/1,000

__________ L amino acids __________ L lipids

× × ×

= __________ L = __________ L = __________ L

2. Multiply volume (L) by kilocalories per liter for base solutions. __________ L dextrose

__________ kcal/L __________ kcal/L __________ kcal/L

= _______ kcal = _______ kcal = _______ kcal

3. Add kilocalories from dextrose, amino acids, and lipids (from #2) to determine total energy. __________ total kcal

4. Determine protein content by multiplying volume of amino acids (L) by grams per liter for base solution. a

Omit lipid calculations for dextrose-based solutions.

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