Final answer:
To complete a subjective global assessment, the dietitian needs to evaluate current body weight to ideal body weight, usual dietary intake using a food frequency questionnaire, and the presence of edema and wasting or dehydration.
Step-by-step explanation:
To complete a subjective global assessment, the dietitian needs to evaluate current body weight to ideal body weight, usual dietary intake using a food frequency questionnaire, and the presence of edema and wasting or dehydration. Serial laboratory parameters over the last 6 months may also provide valuable information, but they are not specifically mentioned as part of the subjective global assessment.