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.
Note:
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 D_{50}W
1000
ml x 50g / 100 ml = 500g dex
500g
dex x 3.4 kcal/g = 1700 kcal



 Practice
Calculations
