MUST (Malnutrition Universal Screening Tool) is a nutritional screening tool easy to use by any trained care-giver and valid for any adult patient. It considers body mass index, weight change and acute disease effect equally and determines a malnutrition risk score. If necessary, anthropometric measures may be simpliyfied by alternative methods. MUST is reliable between different healthcare settings et promotes detection and management of malnutrition during the patient medical course.