C-reactive protein and erythrocyte sedimentation rate (ESR). At my clinic, CRP is normal if <1 and ESR if <21.
They might also check vitamin B12 or other vitamins/minerals that people with Crohn's often become defiecient in (folic acid, vitamin D, etc.).
July 2007 Drug-Induced Liver Injury
January 2008 Crohn's Ileitis
Enteral Nutrition, Omega-3 (Flax Oil and Fish Oil), VSL#3, Vitamin E, Folic Acid, Psyllium