Question

Calculating protein concentration:

I understand that concentration is g/ml, but how can grams of protein divided by ml of the fluid equal percent amino acid solution? (Regarding the example calculation: 88 g / 1509 cc = 0.058 g/ml ... then how can it be 5.8% amino acid solution??)

"Determine protein concentration.

Subtract volume of lipid from fluid requirement to determine remaining fluid needs.

Divide protein requirement (in grams) by remaining fluid requirement and multiply by 100. This gives you the amino acid concentration in %."

back I next Example Calculation Nutrient Needs: Kcals: 1800 Protein: 88 g Fluid: 2000 cc Lipid (10%): 1800 kcal x 30%-540 kcal 540 kcal 1.1 kcal/cc-491 cc/24hr- 20 cc/hr 10% lipid Remaining fluid needs: 2000cc-491cc = 1509cc Remaining kcal needs: 1800 - 540- 1260 kcal Protein: 88 g / 1 509 cc x 100 = 5.8% amino acid solution Dextrose: 1260 kcal/ 3.4 kcal/g 371 g dex 371 g 1509 cc x 100- 24.6% dextrose solution Rate of Amino Acid / Dextrose: 1509 cc / 24hr = 63 cc/hr

Answer 1

To calculate the grams of protein in TPN solutions, multiply the total volume of aminoacids solutions (in ml) in a day by aminoacid concentration.

Here in 1000ml X 5.8%/100ml = 58g

Divide protein requirement (g) by fluid requirement and multiply by 100 to determine aminoacid concentration in %

Multiply protein needs in grams X 4 to determine calories from protein .