Mini Nutritional Assessment (MNA) in Older Adults

The Mini Nutritional Assessment (MNA) is a screening and assessment tool designed specifically for older adults. It uses items on intake, weight change, mobility, psychological stress, neuropsychological problems, and anthropometry to classify older people as well-nourished, at risk of malnutrition, or malnourished, with a short form available for rapid screening.

Definition

The MNA is an age-specific instrument that combines screening and assessment items - dietary intake, weight loss, mobility, acute illness or psychological stress, neuropsychological status, and body mass index or calf circumference - into a category of normal nutritional status, at risk of malnutrition, or malnourished.

Scope

The entry describes the MNA's components, its short-form version, and its role as the geriatric tool recommended within nutrition screening guidance. It is a methodological reference topic and does not provide clinical scoring decisions or treatment instructions.

Key concepts

• Geriatric-specific screening
• Full MNA versus short form (MNA-SF)
• Food intake and weight loss items
• Mobility and psychological stress
• Neuropsychological problems (dementia, depression)
• Body mass index or calf circumference
• Three-category classification
• Use across community, hospital, and long-term care

Mechanisms

The MNA scores items spanning recent decline in food intake, weight loss, mobility, acute disease or psychological stress, neuropsychological problems, and an anthropometric measure (body mass index, or calf circumference when height and weight are hard to obtain). The summed score places an older adult into one of three nutritional categories. The short form (MNA-SF), developed by Rubenstein and colleagues, retains the most predictive screening items so the tool can be applied quickly, with the full assessment used to characterize those who screen positive. The instrument's content was chosen to reflect risk factors specific to ageing populations.

Clinical relevance

The MNA is the tool recommended for older adults within nutrition screening guidance and is recognized within the GLIM framework as a screening route to malnutrition diagnosis in this group. As a reference topic this entry explains the tool's structure and validation basis; it is descriptive and does not provide individualized scoring or treatment advice.

Epidemiology

The MNA has been used widely across community-dwelling, hospitalized, and institutionalized older adults, with reported prevalence of malnutrition and at-risk status varying markedly by setting - typically lowest in the community and highest in rehabilitation and long-term care. Its geriatric focus distinguishes it from tools developed mainly for general adult or inpatient use.

History

The MNA was developed in the early 1990s by Guigoz, Vellas, and colleagues to address nutritional risk specific to older adults, and was presented and validated through the late 1990s. Rubenstein and co-workers introduced the short form in 2001 to speed routine screening. The 2002 ESPEN guidelines recommended the MNA as the tool of choice for older people, and the later GLIM consensus positioned it as an entry point to standardized malnutrition diagnosis in this population.

Debates

Anthropometry when measurement is difficult

Body mass index can be hard to obtain in frail or immobile older adults, so calf circumference is offered as a substitute in the short form, raising questions about comparability between the two measurement routes.

Key figures

• Yves Guigoz
• Bruno Vellas
• Laurence Rubenstein
• Philip Garry

Seminal works

• guigoz-1999
• rubenstein-2001

Frequently asked questions

Why is the MNA specific to older adults?

Its items include risk factors particularly relevant to ageing - mobility, neuropsychological problems such as dementia or depression, and acute illness - so it was designed and validated for geriatric populations.

What is the MNA short form?

The MNA-SF, developed by Rubenstein and colleagues, keeps the most predictive screening items so the tool can be applied quickly, with the full MNA used to assess those who screen positive.