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

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

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%*

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.
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.

ISSN: 1478-6362