TPN Macronutrient Calculator (Glucose/AA/Lipid)

TPN Macronutrient Calculator (Glucose/AA/Lipid) | Online Free Tool | Elysia Tools

Tool usage guide

Learn when to use this tool, what it supports, and how real users apply it.

Key facts

Category: Health
Input types: number, select
Output type: json
Sample coverage: 4
API ready: Yes

Overview

The TPN Macronutrient Calculator analyzes a parenteral nutrition prescription using patient weight, dextrose and amino-acid concentrations and volumes, lipid emulsion selection, and lipid volume. It estimates macronutrient grams, calories, total and non-protein calories, nitrogen-related ratios, and per-kilogram values. This is a prescription-analysis aid, not a compounding recipe or medical advice.

When to use

Review the calorie and protein contribution of a proposed TPN prescription.
Compare dextrose, amino-acid, and lipid delivery on a per-kilogram basis.
Check total calories, non-protein calories, and the non-protein kcal:g nitrogen ratio.

How it works

1Enter the patient weight in kilograms.
2Enter the dextrose and amino-acid concentrations and total volumes.
3Select the lipid emulsion concentration and enter its total volume.
4The calculator estimates grams, kcal, total and non-protein calories, nitrogen-related values, ratios, and per-kilogram results.

Use cases

Clinical nutrition review of adult parenteral nutrition prescriptions.
Pharmacy and nutrition-support checks of macronutrient and calorie delivery.
Education on how dextrose, amino acids, lipids, and patient weight affect TPN calculations.

Examples

1. Standard adult TPN review

Nutrition-support clinician

Background

A clinician is reviewing a prescription for a 70 kg adult containing D25W, amino-acid solution, and 20% lipid emulsion.

Problem

Estimate the macronutrient grams, calorie contribution, total calories, and values per kilogram.

How to use

Enter a weight of 70 kg, dextrose at 25% with 1000 mL, amino acids at 8.5% with 500 mL, select 20% lipid emulsion, and enter 250 mL of lipid volume.

{"weight":70,"dextrosePercent":25,"dextroseVolume":1000,"aaPercent":8.5,"aaVolume":500,"lipidEmulsion":"20%","lipidVolume":250,"decimalPlaces":1}

Outcome

The calculation estimates 250 g dextrose and 850 kcal, 42.5 g amino acids and 170 kcal, and 50 g lipid and 500 kcal, for about 1520 kcal total and 21.7 kcal/kg.

2. Protein-focused permissive underfeeding review

Critical-care dietitian

Background

An 80 kg patient has a lower-calorie prescription with higher amino-acid delivery and a smaller lipid volume.

Problem

Quantify the prescription's protein and calorie profile and assess its non-protein calorie-to-nitrogen balance.

How to use

FAQ

What inputs does the calculator require?

It requires patient weight, dextrose concentration and volume, amino-acid concentration and volume, lipid emulsion type, and lipid volume.

Which lipid emulsion concentrations are supported?

The calculator supports 10%, 20%, and 30% lipid emulsions.

How are dextrose calories estimated?

Dextrose is estimated at 3.4 kcal per gram.

How are amino-acid calories estimated?

Amino acids are estimated at 4.0 kcal per gram.

Can this tool be used as a compounding recipe?

No. It analyzes prescription inputs and is not a compounding recipe or a substitute for clinical review.

{"weight":80,"dextrosePercent":20,"dextroseVolume":500,"aaPercent":10,"aaVolume":1000,"lipidEmulsion":"20%","lipidVolume":100,"decimalPlaces":1}

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Learn when to use this tool, what it supports, and how real users apply it.

Key facts

Overview

When to use

How it works

Use cases

Examples

1. Standard adult TPN review

2. Protein-focused permissive underfeeding review

FAQ

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