Autoimmune DiseaseKey Blood TestsSystemic Lupus Erythematosus (SLE)ANA, anti-dsDNA, anti-Smith, low C3/C4, antiphospholipid antibodiesRheumatoid Arthritis (RA)Rheumatoid Factor (RF), anti-CCP (ACPA), ESR, CRPSjogren’s SyndromeAnti-SSA (Ro), Anti-SSB (La),...