C4A and anemia: Anaemia (Haemoglobin: 63 g/L).Leucocytosis (White cell count: 6.8 × 109/L).Thrombocytopenia (Platelet count: 91 × 109/L).Mildly impaired kidney function (Creatinine: 146 μmol/L).Elevated ANA and dsDNA levels (667 IU/mL).Low complement components (C3: 0.32 g/L, C4: 0.04 g/L).