Geriatric Nutritional Risk Index (GNRI) Calculator
Nutritional Risk Assessment
Enter body weight and serum albumin to calculate GNRI. Albumin must be entered in g/L.
About the GNRI
The Geriatric Nutritional Risk Index (GNRI) was developed to estimate nutrition-related risk in older hospitalized patients using serum albumin and the ratio of actual to ideal body weight. It may help identify patients at increased risk of nutrition-related complications and mortality.
Formula
GNRI = 1.489 × serum albumin (g/L) + 41.7 × (actual body weight / ideal body weight)
The weight ratio is set to 1 when actual body weight exceeds ideal body weight. The original method defined ideal body weight using the Lorentz formula; this calculator accepts ideal body weight as an input so the clinician can apply the method specified by their setting or protocol.
Risk categories
| GNRI score | Nutrition-related risk |
|---|---|
| Below 82 | Major risk |
| 82 to below 92 | Moderate risk |
| 92 to 98, inclusive | Low risk |
| Above 98 | No risk by GNRI classification |
Reference
Clinical use
GNRI categories were derived in older medical patients and should be interpreted in the context of the population and clinical setting. Serum albumin may also be affected by inflammation, fluid status, hepatic disease, renal disease, and factors beyond nutritional intake.
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