Loading...
Printed on 7/20/2026
For informational purposes only. This is not medical advice.
The Geriatric Nutritional Risk Index (GNRI) is a nutrition-risk metric used in older populations to estimate morbidity and mortality risk associated with undernutrition. Lower scores indicate higher nutritional risk and may guide intervention intensity.
Formula: GNRI is a composite nutrition-risk index; lower totals indicate higher risk.
Save your results with a free account
Keep a history of calculations, favorite tools, and access your dashboard anytime.
Obtain three values: serum albumin (g/L), current body weight (kg), and patient height (m). Calculate ideal body weight as 22 × height squared (Lorentz formula). If current weight exceeds ideal weight, the weight ratio is capped at 1.0.
Calculate GNRI = 1.489 × albumin (g/L) + 41.7 × (current weight / ideal weight). A serum albumin value of 35 g/L and current weight equal to ideal weight produces a GNRI of approximately 100, representing no nutritional risk.
Classify: above 98 = no risk; 92-98 = low risk; 82-91 = moderate risk; below 82 = severe risk. Lower GNRI categories are associated with increased 1-year mortality, infectious complications, and prolonged hospitalization in older adults, and should trigger intensified nutrition support.
Dietitians & Nutritionists
GNRI is calculated at hospital admission to stratify older patients by malnutrition-related risk. Patients in the moderate and severe risk categories should receive early dietitian review and structured nutrition support planning before clinical deterioration occurs.
Nephrology Teams
GNRI is validated in chronic kidney disease and hemodialysis populations where serum albumin reflects both nutritional status and systemic inflammation. Serial GNRI monitoring guides protein supplementation and nutritional support intensity in dialysis patients.
Cardiology Teams
Cardiac cachexia and malnutrition worsen heart failure outcomes. GNRI identifies heart failure patients with nutritional risk who may benefit from targeted nutritional rehabilitation to improve functional capacity and reduce rehospitalization.
Geriatric Care Teams
Apply GNRI quarterly in residential aged care and long-term care facilities to detect progressive malnutrition in residents. Early identification allows dietary enhancement, oral supplement prescription, and specialist referral before significant weight loss occurs.
Surgical Teams & Anesthesiologists
Pre-operative GNRI below 92 is associated with increased post-operative complications including wound infection, prolonged stay, and anastomotic leak. Identifying severe nutritional risk before elective surgery allows pre-operative nutrition optimization.
Serum albumin is a negative acute-phase reactant—it falls with systemic inflammation, illness, and fluid overload independently of nutritional intake. Low albumin in acutely ill patients may reflect acute-phase response rather than chronic malnutrition. Interpret GNRI in context of C-reactive protein and clinical status.
GNRI uses the Lorentz ideal body weight formula (22 × height² in meters). This differs from other ideal weight formulas. Using an incorrect formula will produce an incorrect weight ratio and invalid GNRI. Always apply the Lorentz formula specifically.
When current weight exceeds ideal weight, the weight ratio is set to 1.0 (not the actual ratio above 1). This prevents GNRI from being artificially elevated in obese patients who may still be nutritionally at risk due to sarcopenic obesity.
A single GNRI score provides a snapshot. Serial assessments at 1-3 month intervals in at-risk patients allow detection of progressive nutritional deterioration before severe outcomes occur. Declining GNRI trend should trigger escalation of support.
GNRI identifies risk level but does not characterize the nature or cause of malnutrition. Pair with dietary intake history, anthropometric measurements (mid-arm circumference, handgrip strength), and swallowing assessment for comprehensive nutrition care planning.
Fluid retention and edema falsely elevate measured body weight, which can inflate GNRI and underestimate nutritional risk. In patients with ascites, heart failure, or peripheral edema, use dry weight or clinical judgment to interpret GNRI scores.
GNRI, CONUT, and MNA assess overlapping but distinct aspects of nutritional risk. GNRI uses weight and albumin; CONUT adds cholesterol and lymphocytes; MNA includes dietary, functional, and anthropometric items. Using two complementary tools improves sensitivity for at-risk patients.
GNRI accuracy depends on albumin being current. Albumin measured more than 2-4 weeks prior may not reflect current nutritional status in rapidly changing clinical situations. Document the date of the albumin result used in GNRI calculation.
GNRI has broad validation in geriatric and chronic disease cohorts as a prognostic nutrition-risk indicator.
Lower GNRI scores indicate higher nutrition-related risk and support proactive intervention.
Use for nutrition-risk stratification in older adults, especially in medically complex populations.
Cutoff performance varies by population and disease context; integrate with full clinical nutrition assessment.
Disclaimer: This tool is for educational and informational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider with questions about your health.
April 21, 2026 · trust-baseline
Clinical trust metadata enabled for this tool page with structured review/version fields.
A lab-based nutrition screening score (0-12) combining albumin, cholesterol, and lymphocyte components.
OpenGeriatricsScreen malnutrition risk in older adults with the MNA-SF 6-item tool (score 0-14).
OpenGeriatricsCalculate full MNA score (0-30) to classify normal nutrition, risk of malnutrition, or malnutrition in older adults.
OpenGeriatricsA 4-item appetite screen (4-20) used to identify older adults at risk for short-term weight loss.
Open