TPN & Nutrition Calculation Practice
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Total parenteral nutrition problems total the calories from dextrose, amino acids, and lipids. The IV energy densities differ from the familiar oral macronutrient values — a distinction the exam tests directly.
FormulasIV: dextrose 3.4 kcal/g • protein 4 kcal/g • 20% lipid = 2 kcal/mLOral/enteral: carbohydrate 4 kcal/g • protein 4 kcal/g • fat 9 kcal/g
Worked example
Calories from 1,000 mL of dextrose 20%? Grams = 1,000 × 20% = 200 g; 200 × 3.4 = 680 kcal.
💡 Read the ask: total vs nonprotein kcal changes whether you include the amino acid calories.