They show what the inflammation levels are in your body. Although they may not always be the most accurate thing at determining a flare. There are some here that say they have symptoms and feel bad, yet their numbers be in the normal range.
For me with this flare my sed rate was 76! Normal would be 20! So mine was off the charts, and boy was a I feeling it!
Diagnosed with Crohn's Disease 2/06 after sever GI bleed. Has been suffering since 1998. History of rectal fistula and gallbladder removal. Currently taking Prednisone: tapered to 35 mg, Asacol, Questran, Toprol XL (for high blood pressure).