Not generally an ED diagnosis
Evaluate for emergent complications
Thorough physical exam to evaluate for purpura (poor prognosis in primary<unk> 
Rheumatoid factor is found in 70% of patients
Anti-SS-A/Ro, and<unk> -B/La antibodies are part of diagnostic criteria
Elevated ESR
Hypergammaglobulinemia
Sjögren syndrome
Sicca complex due to other autoimmune diseases
Behçet's disease
Sarcoidosis
Sweet's syndrome
Rheumatoid arthritis
Scleroderma
SLE