Malnutrition Universal Screening Tool (MUST)

Screen for malnutrition risk using the Malnutrition Universal Screening Tool (MUST). Step 1: BMI score (above 20 = 0, 18.5-20 = 1, below 18.5 = 2). Step 2: weight loss score (0-5% = 0, 5-10% = 1, above 10% = 2). Step 3: acute disease effect (if acutely ill and no nutrition for more than 5 days, add 2). Total 2 or higher = high risk; 1 = medium risk; 0 = low risk.

Weight
Height
Clinical Guidance

BMI is a screening measure of body size, not a direct measure of body fat. The standard WHO categories are underweight (<18.5), normal (18.5–24.9), overweight (25–29.9), and obese (≥30).

BMI can overestimate body fat in athletes with high muscle mass and underestimate it in older adults with low muscle mass. Interpret it alongside waist circumference and clinical context rather than as a standalone diagnosis.

⚕ Clinical Disclaimer: These calculators are for educational and reference purposes only. Always verify results with qualified clinical judgment and current clinical guidelines. Do not use as a sole basis for medical decisions.
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How It Works

Screen for malnutrition risk using the Malnutrition Universal Screening Tool (MUST). Step 1: BMI score (above 20 = 0, 18.5-20 = 1, below 18.5 = 2). Step 2: weight loss score (0-5% = 0, 5-10% = 1, above 10% = 2). Step 3: acute disease effect (if acutely ill and no nutrition for more than 5 days, add 2). Total 2 or higher = high risk; 1 = medium risk; 0 = low risk

Each component has a specific meaning:

  • Malnutrition Universal Screening Tool — The malnutrition universal screening tool recorded for the scenario being assessed.

Note: Interpret the must score result against the thresholds and context described above.

How to Use

Enter the Malnutrition Universal Screening Tool for the scenario you are assessing. Screen for malnutrition risk using the Malnutrition Universal Screening Tool (MUST). Step 1: BMI score (above 20 = 0, 18.5-20 = 1, below 18.5 = 2). Step 2: weight loss score (0-5% = 0, 5-10% = 1, above 10% = 2). Step 3: acute disease effect (if acutely ill and no nutrition for more than 5 days, add 2). Total 2 or higher = high risk; 1 = medium risk; 0 = low risk. Use the must score result to inform your calculation.

Frequently Asked Questions