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Does having a low Geriatric Nutritional Risk Index increase my risk of Postoperative Delirium?

high confidence  ·  Last reviewed May 15, 2026

The Geriatric Nutritional Risk Index (GNRI) is a simple score that uses your blood albumin level and body weight to assess nutritional status. Several large studies have looked at whether a low GNRI (indicating malnutrition) raises the risk of postoperative delirium (POD) — a sudden confusion that can happen after surgery. The evidence consistently shows that a low GNRI is associated with a higher chance of developing POD, especially in older adults.

What the research says

Multiple meta-analyses have confirmed the link between low GNRI and increased POD risk. One meta-analysis of 12 cohort studies involving 12,332 surgical patients found that low GNRI was associated with a 62% higher risk of POD (RR = 1.62, 95% CI: 1.34–1.96) 410. Another meta-analysis of 6 studies with 4,242 patients reported that moderate and high GNRI (indicating better nutrition) significantly increased the risk of POD compared to low GNRI (OR = 2.04, 95% CI: 1.58–2.64) 8. The association was stronger in patients older than 74 years and when using a GNRI cutoff below 98 410. A study of 324 elderly patients undergoing spine surgery found that each unit increase in GNRI reduced the odds of POD by about 29% (OR 0.714, 95% CI: 0.540–0.944) 9. These findings are consistent across different surgical populations, including oral and maxillofacial surgery 3 and general non-cardiac surgery 7. While other factors like age, sex, and alcohol use also contribute to POD risk 3, nutritional status as measured by GNRI appears to be an independent and modifiable risk factor.

What to ask your doctor

  • Can you calculate my Geriatric Nutritional Risk Index (GNRI) before my surgery?
  • If my GNRI is low, what steps can I take to improve my nutrition before the operation?
  • Are there other nutritional screening tools you recommend for assessing my risk of postoperative delirium?
  • How does my age and overall health affect the risk of delirium after surgery?
  • What can be done during and after surgery to lower my chances of developing delirium?

This question is drawn from common patient questions about this topic and answered using cited medical research. We do not provide individualized advice.