Nutrition Assessment and Malnutrition - What is the Latest?
The Question
What nutrition assessment process can be used to diagnose malnutrition in adults admitted to hospital?
The Recommendation
There is no gold standard for the assessment of nutritional status and no tool can replace a clinician’s judgment in interpreting information obtained from history, physical examination, anthropometric measurements and laboratory data; however, standardized processes are desired to promote consistency in the diagnosis of malnutrition.
The GLIM criteria, a consensus from the Global Clinical Nutrition Community, recommends that a diagnosis of malnutrition be made on the presence of at least one phenotypic criteria and one etiologic criteria. The phenotypic criteria include non-volitional weight loss, low BMI and reduced muscle mass. The etiologic criteria include reduced food intake/assimilation and disease burden/inflammation. These clinical measures are included in a range of existing tools designed to diagnose malnutrition. The phenotypic criteria can be used to classify the severity of malnutrition. The groups recommend that any diagnosis of malnutrition be followed with a comprehensive nutrition assessment.
There are a range of tools that have been validated for nutrition assessment in many individual studies. The above GLIM criteria are incorporated into many existing validated tools used to diagnose malnutrition in adults, such as the Subjective Global Assessment (SGA).
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Nutrition Screening and Assessment Tools: Assessment Tools.
Country-specific Recommendations
The ICD-10-Australian Modification definition for malnutrition is regularly used for diagnosis and coding of malnutrition in Australian hospitals.

The Canadian Malnutrition Task Force recommends the use of the Subjective Global Assessment as the gold standard for diagnosing malnutrition.

The U.K. National Institute for Health and Care Excellence (NICE) Guidelines defines a person who is malnourished as meeting any of these criteria: BMI <18.5kg/m
2, unintentional weight loss of more than 10% within the preceding three to six months or a BMI <20 kg/m
2 combined with unintentional weight loss of more than 5% within the preceding three to six months.
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