Calculates the geriatric nutritional risk index from serum albumin, body weight and ideal body weight.
Geriatric Nutritional Risk Index: Clinical Guide
Browse Knowledge HubCalculates the geriatric nutritional risk index from serum albumin, body weight and ideal body weight.
Overview
Calculates the geriatric nutritional risk index from serum albumin, body weight and ideal body weight.
Clinical Significance
Screens nutrition-related risk in older adults. It is not a diagnosis of malnutrition and should be combined with clinical and dietary assessment.
How It Is Calculated
- GNRI = 1.489 × albumin (g/L) + 41.7 × min(weight/ideal weight, 1).
Interpretation
- Screens nutrition-related risk in older adults. It is not a diagnosis of malnutrition and should be combined with clinical and dietary assessment.
Worked Example
Enter a clinically consistent set of values in the displayed units. MedicalC applies: GNRI = 1.489 × albumin (g/L) + 41.7 × min(weight/ideal weight, 1).
Limitations
- This tool does not establish a diagnosis or mandate treatment.
- Published cut-offs may vary between cohorts and measurement methods.
- Calculation precision cannot compensate for poor source data.
Clinical Pearls
- Trend the result over time where clinically appropriate.
- Record the source values and units alongside the calculated result.
Common Mistakes
- Using the wrong unit.
- Combining measurements obtained at different times.
- Applying a research-derived threshold as a universal treatment trigger.
Frequently Asked Questions
What does this calculator provide?
Calculates the geriatric nutritional risk index from serum albumin, body weight and ideal body weight.
Can this result be used alone?
No. It must be interpreted with clinical context and appropriate investigations.
What equation is used?
GNRI = 1.489 × albumin (g/L) + 41.7 × min(weight/ideal weight, 1).
What is the main limitation?
The result depends on valid inputs and may not be calibrated for every population or setting.
References
- Bouillanne O et al. Geriatric Nutritional Risk Index: a new index for evaluating at-risk elderly medical patients. Am J Clin Nutr. 2005. — Formula, physiological or validation reference.
Reviewed by: MedicalC Clinical Editorial Team
Last reviewed: July 2026
Clinical Disclaimer
MedicalC calculators and clinical tools are intended to support healthcare professionals. They do not replace clinical judgement, individual patient assessment, local guidance or specialist advice.
Results should always be interpreted in the context of the patient’s history, examination, investigations, current clinical condition and applicable professional guidance.