Enteral and Parenteral Nutrition Summary
Analyzes the nutritional components of enteral and parenteral nutrition
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About This Calculator
How many calories is my patient getting?
This calculator is intended to provide clinicians with a 'snapshot' of a patient's existing enteral and parenteral nutrition status. Rather than providing a recommended nutritional regimen, this evaluation and analysis tool will summarize a patient's nutritional intake as it relates to total calories, macronutrients, fluid, and weight-based nutritional metrics (eg, protein per kg, kcal per kg, etc.). In its simplist form, it answers the question of "How many calories is my patient getting"?
If you are interested in calculating a new regimen for a patient, please see the TPN Macronutrient Calculator or Enteral Nutrition Calculator for dosing recommendations.
Nutritional weight calculation
In obese patients, this calculator uses a correction adjustment of 25% (see equation below); however, it is important to note that a higher correction coefficient (ie, 50%) may be appropriate for patients on chronic enteral or parenteral therapy when the goal is to provide full calories.2
$$\\ Nutritional\;weight = IdealBW + 0.25*(ActualBW - IdealBW)$$
Macronutrient Caloric Density
The following macronutrient caloric density are used for calculations:
An osmolarity calculation may be useful for determining whether a patient's TPN requires a central line (>900 mOsm/L) or if it may be infused via a peripheral line (eg, "peripheral parenteral nutrition", or PPN).3 Note that the osmolarity calculation included in this calculator does not account for electrolytes, which will significantly contribute to a formulation's osmolarity.
References and Additional Reading
- National Heart, Lung, and Blood Institute (NHLBI). Classification of Overweight and Obesity by BMI, Waist Circumference, and Associated Disease Risks. http://www.nhlbi.nih.gov/health/public/heart/obesity/lose_wt/bmi_dis.htm. Accessed February 24, 2013.
- Krenitsky J. Adjusted body weight, pro: evidence to support the use of adjusted body weight in calculating calorie requirements. Nutr Clin Pract. 2005;20(4):468-73. PMID 16207686.
- Pittiruti M, Hamilton H, Biffi R, et al. ESPEN Guidelines on Parenteral Nutrition: central venous catheters (access, care, diagnosis and therapy of complications). Clin Nutr. 2009;28(4):365-77. PMID 19464090.