Erythrocyte Sedimentation Rate (ESR)
The erythrocyte sedimentation rate (ESR) indirectly measures proteins in the blood that are associated with inflammation. ESR is measured to monitor the level of inflammation anywhere in your body. This test can be particularly helpful in determining if you are having active inflammation during a flare of IBD.
It is possible for someone with IBD to have high levels of markers of inflammation but feel well. The reverse is also true: levels of markers of inflammation like ESR can be low but you still have active disease.
But more often than not, ESR will be elevated when there is a flare occurring.
Normal value: 0-11 mm/hr