Four out of the 11 features are required:
Malar rash Discoid rash Photosensitivity (see figure 1) Oral ulcers Arthritis Serositis (pleurisy or pericarditis) Renal disorder (proteinuria >0.5 g/24 h or cellular casts) Neurological disorder Haematological disorder (haemolytic anaemia, leucopenia or lymphopenia on two or more occasions, or thrombocytopenia) Immunological disorder Antinuclear antibody
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