TPN solution contains 1000 mL of 50% dextrose.The nurse calculates that this solution provides _____ kcalories from carbohydrate.
A)500
B)1700
C)1500
D)2200

Question

Quizplus · Accepted Answer

To calculate the kcalories from carbohydrate, we need to know the amount of dextrose in the solution. 50% dextrose means that there are 500 grams of dextrose in the 1000 mL solution. Each gram of carbohydrate provides 4 kcal, therefore the solution provides 500 x 4 = 2000 kcalories from carbohydrate. To calculate the kcalories from carbohydrate, we can use the following formula: 
Total volume of solution (mL) x % concentration of dextrose x 3.4 kcal/g
= 1000 x 0.5 x 3.4
= 1700 kcal

TPN Solution Contains 1000 ML of 50% Dextrose