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Table 1 Concentrations and proportion of anti-CCP2 IgG in plasma and synovial fluid

From: Affinity purified anti-citrullinated protein/peptide antibodies target antigens expressed in the rheumatoid joint

  Plasma (n = 16) SF (n = 26)
Median Range Median Range
Total IgG concentration, mg/mL 14.6 6.5-25.7 3.5 0.9-15.2
Anti-CCP IgG concentration, mg/mL 0.2 0.05-0.5 0.06 0.01-0.2
Proportion of anti-CCP IgG, %a 1.5 0.4-3.6 2.2 0.1-15.6
  1. aCalculated as the percentage of anti-CCP2 IgG of total IgG. CCP, cyclic citrullinated peptide; IgG, immunoglobulin G; SF, synovial fluid.