You need to call your local registry. I am guessing that you would not be allowed to because people with other autoimmune diseases [RA, lupus, MS, etc] are ineligible. My local blood bank has criteria listed on their website for joining the local registry. Perhaps you can find yours online.
Moderator Crohn's Disease Forum
CD, Ankylosing Spondylitis, lupus, small fiber peripheral neuropathy, avascular necrosis, peripheral artery disease, degenerative disc disease, and a host of other medical problems.