TPN Calculations for a 2/1 When you have to calculate the nutrients in a given solution: REMEMBER: gm % vol Example: D15%A5% @ 75cc/hr + 10% IL @20cc/hr Patient wt = 65 kg 1. Calculate the dextrose/AA volume infused in 24 hrs. 75cc/hr x 24 hrs = 1800cc 2. Calculate the grams of dextrose by multiplying the total volume by the concentration (%) of dextrose. 1800cc x 15% = 270 gms 3. Calculate the GUR (mg/kg/min) by multiplying the gm of dextrose by 1000, then divide by the patient’s weight in kg, then divide by 24 (hrs), then divide by 60 (min). 270 x 1000 = 270,000 – 65 = 4154 – 24 = 173 – 60 = 2.9 mg/kg/min 4. Calculate the grams of AA (protein) by multiplying the total volume by the concentration (%) of AA. 1800cc x 0.05 = 90 gms 5. Calculate total calories provided by TPN solution by multiplying the grams of dextrose and AA by their respective cal/gm. (dextrose = 3.4 cal/gm, AA = 4.0 cal/gm) Then add calories from fat by multiplying the ml infused in 24 hrs by 1.1 cal/ml of 10% IL or 2.0 cal/ml of 20% IL Dextrose: 270 gm x 3.4 = 918 calories AA: 90 gm x 4.0 = 360 calories IL: 480 ml (20ml x 24hrs) x 1.1 cal/ml (10% IL) = 528 calories 918 + 360 + 528 = 1806 total calories 6. Calculate % of calories from fat by multiplying the ml of IL by 10% or 20% to get the gm of fat, then multiply the number of gm by 9 cal/gm to get fat calories. Then divide fat calories by the total TPN calories and then multiply by 100 to get %. 480 ml IL x 10% = 48 gm fat x 9 cal/gm = 432 fat calories 432 fat calories – 1806 total calories = 0.239 x 100 = 24% calories from fat When you have to recommend a TPN order based on a patient’s nutrient needs: Example: Use Parenteral Case Study and fill in the steps.

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# 528 TPN calculations