(A) Well nourished _____. (B) Mild/moderate undernutrition _____. (C) Severe undernutrition _____. The subjective global assessment (SGA) score is a subjective score. Each medical history and physical examination paramater is rated by the clinician as A (well-nourished), B (moderately malnourished), or C (severly malnourished). The ratings for each of the parameters are then used as a guide to determine the patient's subjecitve SGA score. For example, if a patient has more B or C ratings than A ratings, the patient is more likely to be malnourished.