A 5-year-old girl from sub-Saharan Africa is brought to the health clinic by her mother because of diarrhea for the past 4 weeks. Her pulse is 150/min, and blood pressure is 80/40 mm Hg. Physical examination shows edema of the face, abdomen, and legs. She is listless and has reddish hair. Serum
albumin concentration is 1.2 g/dL. Compared with a healthy child, which of the following findings is ...