Controlling Nutritional Status (CONUT)

The Controlling Nutritional Status (CONUT) score is a simple, laboratorybased tool used to assess the nutritional condition of patients. Developed in the early 2000s, CONUT integrates three routine blood parametersserum albumin, total cholesterol, and lymphocyte countto generate a single numeric value that reflects protein reserves, caloric depletion, and immune competence.

Why Nutritional Assessment Matters

Malnutrition is a common yet often underdiagnosed problem in hospitalized, surgical, oncology, and geriatric populations. Inadequate nutrition can worsen disease outcomes, increase infection risk, prolong hospital stay, and raise healthcare costs. Early identification of patients at risk enables timely interventions such as diet modification, supplementation, or referral to a dietitian.

Components of the CONUT Score

Scoring Interpretation

• 01: Normal nutritional status
• 24: Mild malnutrition
• 58: Moderate malnutrition
• 912: Severe malnutrition

How to Use CONUT in Clinical Practice

1. Collect the required labsalbumin, cholesterol, and lymphocyte count are usually part of a basic metabolic panel or complete blood count.
2. Calculate the score using the table above or an online calculator.
3. Interpret the result according to the categories listed. A score 5 signals the need for a detailed nutritional assessment.
4. Initiate interventions such as oral nutritional supplements, highprotein meals, or referral to a multidisciplinary nutrition team.
5. Reevaluate the CONUT score after 714days of therapy to monitor response.

Evidence Supporting CONUT

Multiple studies have demonstrated the prognostic value of CONUT across diverse patient groups:

• Oncology: Higher CONUT scores predict poorer overall survival in gastric, colorectal, and lung cancers.
• Cardiovascular surgery: Preoperative CONUT 5 is associated with increased postoperative complications and longer intensivecare stays.
• Chronic kidney disease: CONUT correlates with mortality risk and can guide timing of dialysis initiation.
• Elderly care: In communitydwelling seniors, CONUT identifies those at risk for frailty and falls.

Advantages of CONUT

• Relies on objective laboratory values; reduces interobserver variability.
• Fast and inexpensiveno special equipment required.
• Combines protein, lipid, and immune parameters for a more comprehensive picture than albumin alone.
• Can be automatically calculated in electronic healthrecord systems.

Limitations and Considerations

• Acute inflammation can lower albumin independently of nutritional status.
• Cholesterol may be affected by statins or liver disease.
• Lymphocyte count can be suppressed by chemotherapy or corticosteroids.
• CONUT is not a substitute for a full dietetic assessment; it should trigger, not replace, professional evaluation.

Practical Tips for Implementation

1. Integrate into order sets. Add CONUT calculation as a reflex test when albumin, cholesterol, and CBC are ordered together.
2. Educate staff. Provide brief training on score interpretation and appropriate followup pathways.
3. Use alerts. Configure EHR alerts for scores 5 to prompt nutrition consults.
4. Track outcomes. Record CONUT scores alongside length of stay, readmission, and mortality to evaluate impact.

Sample Case

Patient: 68yearold male, admitted for elective colon resection.

Lab results: Albumin 2.9g/dL, total cholesterol 118mg/dL, lymphocytes 0.910/L.

Scoring: Albumin 4pts, cholesterol 2pts, lymphocytes 2pts total CONUT = 8 (moderate malnutrition).

Action: Initiate highprotein oral supplement, schedule dietitian visit within 48h, and repeat labs postoperative day5 to reassess.

Further Reading & Resources

• Uchida, T. etal. The CONUT score and its use as a nutritional screening tool in clinical practice. Clinical Nutrition, 2021.
• International Society for Clinical Nutrition and Metabolism (ESPEN) guidelines on malnutrition screening.
• Online CONUT calculator: www.conut.org