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Table 1 Reference values for antibodies tested and their values in Crohn's disease

From: Inflammatory bowel disease serologies in ankylosing spondylitis patients: a pilot study

Antibody Positive cutoff reference value Median value in CD, Range Percent positive in CD
ASCA IgG 20 EU 26.9, 0-415.2 38.1%
ASCA IgA 40 EU 12.5, 0-164 38.1%
Anti-I2 30 EU 18.9, 0-324.1 46.8%
Anti-OmpC 23 EU 15.2, 0-296.4 31.7%
Anti-CBir1 30 EU 26.1, 0-279.7 49%
ANCA 30 EU 1.4-277.7* 74%*
  1. The positive cutoff value is two standard deviations above the mean value in healthy controls. *These values apply to ulcerative colitis as opposed to crohn's disease.
  2. ANCA = antineutrophil cytoplasmic antibodies; anti-CBir1 = anti-flagellin; anti-OmpC = anti-Escherichia coli outer membrane porin C; ASCA = Anti-Saccharomyces cerevisiae antibody; CD = Crohn's disease; EU = ELISA units.