Nutritional Risk Index (Buzby NRI)
Nutritional Risk Index (Buzby, VA-TPN) = 1.519 x albumin (g/L) + 41.7 x (current weight / usual weight); bands >100 none, 97.5-100 mild, 83.5-97.5 moderate, <83.5 severe.
Open the calculator → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- Serum albumin
- 40 g/L
- Current weight
- 60 kg
- Usual weight
- 70 kg
Result: Nutritional Risk Index 96.5 — moderate nutritional risk (bands: >100 none, 97.5-100 mild, 83.5-97.5 moderate, <83.5 severe).
The tool opens with these values already filled in. Replace them with your own.
What the result means
- > 100
- No nutritional risk.
- 97.5-100
- Mild nutritional risk.
- 83.5 to < 97.5
- Moderate nutritional risk.
- < 83.5
- Severe nutritional risk. A lower NRI marks greater perioperative risk.
What you enter
- Serum albumin
- Current weight
- Usual weight
How this is calculated
Buzby GP, et al., for the Veterans Affairs Total Parenteral Nutrition Cooperative Study Group. Perioperative total parenteral nutrition in surgical patients. N Engl J Med. 1991;325(8):525-532. NRI = 1.519 x albumin (g/L) + 41.7 x (current/usual weight). Read the source ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.