An 8-year-old boy underwent a penicillamine provocation test to confirm the diagnosis of hepatolenticular degeneration. Before the test, the laboratory examination showed the following levels: white blood cell count 8.3×10⁹/L, neutrophil 6.0×10⁹/L, hemoglobin 101 g/L, and platelet count 120×10⁹/L. And 24 hours after oral penicillamine 250 mg once, the levels of his white blood cell count, neutrophil, hemoglobin, and platelet count were 1.6×10⁹/L,0.6×10⁹/L,105 g/L, and 92×10⁹/L, respectively. The child was given oral prednisone 10 mg twice daily and two tablets of Diyu Shengbai(地榆升白片) twice daily. Five days later, the re-examination showed his white blood cell count of 3.5×10⁹/L with neutrophil of 1.9×10⁹/L, the hemoglobin level of 108 g/L, and the platelet count of 88×10⁹/L。