Frequency of HLA B27 in IBD
| Crohn’s | UC | |
|---|---|---|
| Sacroiliitis/spondylitis | 55% | 70% |
| Peripheral arthritis a | Same as normal healthy control population | Same as normal healthy control population |
a Some studies report an increase in HLA-B27 in patients with type I arthritis (26% versus 8% in controls).
