Final answer:
To determine if a client with AIDS is at risk for malnutrition, the nurse should review the serum albumin level, as it reflects the individual's nutritional status.
Step-by-step explanation:
A nurse reviewing the laboratory records of a client who has AIDS to determine if the client is at risk for malnutrition should review the client's serum albumin level.
Serum albumin is a protein in the blood that can be indicative of one's nutritional status. Decreased levels of albumin can signal malnutrition, which can be due to inadequate nutrient intake, malabsorption, or increased requirements due to disease.