BTG3 and systemic lupus erythematosus: The patient underwent comprehensive laboratory and radiological investigations, revealing significant findings, including positive Anti Smith antibody (Anti Sm) which is the most specific antibody in SLE and Antinuclear antibody (ANA) which is most sensitive antibody in SLE, with low complement levels (C3, 51 mg/dL; C4, 6 mg/dL).