Nutritional Risk Index (NRI) Calculator

Nutritional Risk Index (NRI) Calculator: Core Functions and Principles

When experiencing abnormal weight loss or low serum albumin levels, the Nutritional Risk Index (NRI) can objectively quantify your risk of malnutrition. This tool calculates your NRI score using the standard formula: [1.519 × serum albumin (g/L)] + [41.7 × (current weight / usual weight)]. It then outputs a nutritional status classification (none / mild / moderate / severe malnutrition). Serum albumin is a core indicator of serum proteins, reflecting the body's nutritional reserves.

Why Choose Our NRI Calculator?

• Strict adherence to medical formulas: Uses the clinically validated NRI calculation model to ensure reliable results.
• Instant classification display: Automatically matches four categories of nutritional status and highlights risk levels with color codes.
• Accessible to everyone: Get professional-grade nutritional risk assessments without registration.

How to Use the Tool

1. Enter your tested value in the serum albumin field (unit: g/L).
2. Enter your current actual weight (unit: kg).
3. Enter your stable weight over the past six months as your usual weight (unit: kg).
4. Click the calculate button to get your NRI score and nutritional status rating.

Frequently Asked Questions (FAQ)

• Q: Does the serum albumin test require fasting?
  A: Yes. Serum albumin testing typically requires fasting for 8-12 hours; otherwise, the accuracy of the results may be affected.
• Q: Who is the NRI suitable for?
  A: It is primarily used for nutritional screening in postoperative patients, the elderly, and patients with chronic diseases. Healthy individuals do not need regular testing. If the calculation indicates moderate or severe malnutrition, clinical validation combining other indicators like prealbumin is recommended.

Important Notes

The input range for serum albumin is 0-100 g/L, and the weight range is 10-200 kg. "Usual weight" refers to your stable weight over the past six months. Calculation results are for reference only; medical decisions require a comprehensive assessment by a professional dietitian.

Technical Notes & Usage Recommendations

Clinical recommendation: When NRI < 97.5, a comprehensive assessment combining indicators like transferrin should be conducted. Typical example: With a serum albumin of 42 g/L, current weight of 60 kg, and usual weight of 70 kg, the NRI is 95.3, indicating mild malnutrition. Regular monitoring can detect weight loss trends; monthly follow-ups are recommended for high-risk groups.