A 52-year-old woman presented with abdominal distension. The laboratory data were as follows: white blood cell count, 7.100/mm3; hemoglobin, 12.2g/dL; platelet count, 206.000/mm3; blood urea nitrogen, 16.8mg/dL; serum creatinine, 1.6mg/dL; sodium, 146mEq/L; potassium, 3.2mEq/L; chloride, 94mEq/L; glucose, 110mg/dL; total protein, 8.6g/dL; and albumin, 4.9g/dL. Random urine protein concentration...
