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To determine kcalories supplied from dextrose in the TPN solution, you must first calculate grams of dextrose. Multiply the total volume of dextrose soln (in ml) supplied in a day by the dextrose concentration. This gives you grams of dextrose supplied in a day. Multiply the grams of dextrose by 3.4 (there are 3.4 kcal/g dextrose) to determine kcalories supplied by dextrose in a day.

If the total dextrose volume is not stated in the prescription, you can calculate it. Just multiply the rate of infusion of dextrose by 24 hr.

*Remember that 1 ml = 1 cc.

Example Dextrose Calculation
1000 ml of D50W

1000 ml x 50g / 100 ml = 500g dex

500g dex x 3.4 kcal/g = 1700 kcal

Practice Calculations

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