What is the Mini Nutritional Assessment (MNA)?
The Mini Nutritional Assessment (MNA) is a validated, 18-item screening and assessment tool specifically designed to detect undernutrition and risk of developing undernutrition in elderly patients (≥65 years) across various care settings including community, nursing homes, and hospitals 1.
Tool Structure and Components
The MNA functions as a two-step procedure 2:
Step 1: MNA-Short Form (MNA-SF) - Screening
The MNA-SF is a 6-item rapid screening tool that takes less than 10 minutes to complete 1. It includes 1:
- Food intake decline over past 3 months (appetite loss, digestive problems, chewing/swallowing difficulties): 0-2 points
- Weight loss during last months: 0-3 points
- Mobility status: 0-2 points
- Acute disease or psychological stress in past 3 months: 0-2 points
- Neuropsychological problems (dementia/depression): 0-2 points
- Body Mass Index (BMI): 0-3 points
MNA-SF Scoring (maximum 14 points) 1:
- ≥12 points: Normal nutritional status - no further assessment needed
- ≤11 points: Possible malnutrition - proceed to full MNA assessment
Step 2: Full MNA - Complete Assessment
If the MNA-SF indicates risk, the full 18-item MNA adds detailed questions about 2:
- Dietary intake patterns (number of meals, food/fluid consumption, feeding autonomy)
- Anthropometric measurements (mid-arm and calf circumference)
- Global assessment (lifestyle, medications, mobility)
- Self-perception of health and nutrition
Clinical Performance and Validation
The MNA-SF demonstrates excellent diagnostic accuracy 3:
- Sensitivity: 97.9%
- Specificity: 100%
- Diagnostic accuracy: 98.7% for predicting undernutrition
- Strong correlation with full MNA score (r = 0.945)
The optimal cut-off for the MNA-SF is ≥11 points to identify normal nutritional status 3. More recent evidence suggests refined thresholds for specific outcomes: ≤7 points predicts 60-day mortality (sensitivity 73.7%, specificity 64.0%) and ≤8 points predicts postoperative complications (sensitivity 74.4%, specificity 51.6%) in geriatric hip fracture patients 4.
Predictive Validity for Clinical Outcomes
The MNA has demonstrated strong associations with 1, 2:
- Mortality risk in elderly populations
- Adverse health outcomes and functional decline
- Hospital length of stay (reduced with targeted intervention)
- Healthcare costs and resource utilization
- Social functioning deterioration
Prevalence of Malnutrition by Setting
Using the MNA across >10,000 elderly patients, malnutrition prevalence varies dramatically 2:
- Community-dwelling healthy elderly: 1%
- Outpatients receiving home care: 4%
- Alzheimer's disease patients at home: 5%
- Hospitalized patients: 20%
- Institutionalized elderly: 37%
Key Advantages
The MNA uniquely captures physical and mental aspects affecting elderly nutrition that other screening tools miss 1, making it particularly valuable for frail elderly populations. It can detect nutritional risk even when albumin levels and BMI remain in normal ranges 2.
The tool has been:
- Translated into multiple languages 5
- Successfully used by nurses, dietitians, and physicians with good inter-observer reliability (κ=0.51-0.67) 1
- Applied in 99% of newly admitted patients, demonstrating excellent practicability 1
Clinical Application
Use the MNA-SF as first-line screening in all elderly patients (≥65 years) at hospital admission, nursing home entry, or during home care assessment 2. The two-step approach efficiently identifies the ~20% of at-risk patients who require comprehensive nutritional intervention 1, while avoiding unnecessary detailed assessment in well-nourished individuals.
The MNA can also screen for frailty: MNA-SF cut-off of 11.0 detects frailty with 71.2% sensitivity and 92.8% specificity 6, providing dual utility in geriatric assessment.