The nurse is caring for an elderly client admitted with a 20…

The nurse is caring for an elderly client admitted with a 20-lb weight loss over 3 months and poor oral intake. The client has generalized weakness and a serum albumin of 2.4 g/dL (normal: 3.5–5.0 g/dL). Which additional laboratory value should the nurse review to best assess the client’s current protein status?