76. A previously healthy 4-year-old boy is brought to the physician because of a 1-week history of easy fatigability and swelling of his face and feet. His temperature is 37.1°C (98.8°F), pulse is 100/min, respirations are 20/min, and blood pressure is 85/67 mm Hg. Physical examination shows facial edema, abdominal distention, and a 3-cm umbilical hernia. There is 3+ pitting edema of the ankles and feet. Laboratory studies show: Serum Na+ Albumin Cholesterol Triglycerides Urine protein A) B-lymphocyte differentiation B) Natural killer cells C) Neutrophil oxidative burst D) Serum IgG concentration E) T-lymphocyte population 131 mEq/L (N=138-145) 2.5 g/dL (N=3.5-5.5) 210 mg/dL (N=109-189) 111 mg/dL (N=30-86) 4+ A One week later, the patient develops a temperature of 39°C (102.2°F), severe abdominal pain, and chills. Abdominal paracentesis yields turbid peritoneal fluid that grows Streptococcus pneumoniae. Further studies will most likely show a decrease in which of the following in this patient?

76. A previously healthy 4-year-old boy is brought to the physician because of a 1-week history of easy fatigability and swelling of his face and feet. His temperature is 37.1°C (98.8°F), pulse is 100/min, respirations are 20/min, and blood pressure is 85/67 mm Hg. Physical examination shows facial edema, abdominal distention, and a 3-cm umbilical hernia. There is 3+ pitting edema of the ankles and feet. Laboratory studies show: Serum Na+ Albumin Cholesterol Triglycerides Urine protein A) B-lymphocyte differentiation B) Natural killer cells C) Neutrophil oxidative burst D) Serum IgG concentration E) T-lymphocyte population 131 mEq/L (N=138-145) 2.5 g/dL (N=3.5-5.5) 210 mg/dL (N=109-189) 111 mg/dL (N=30-86) 4+ A One week later, the patient develops a temperature of 39°C (102.2°F), severe abdominal pain, and chills. Abdominal paracentesis yields turbid peritoneal fluid that grows Streptococcus pneumoniae. Further studies will most likely show a decrease in which of the following in this patient?