My sed rate is 51 is that bad and what is a sedrate for?

It depends: It depends on why they are doing the sed rate. What your symptoms are and what they are looking for. From the Mayo Clinic Website: Sed rate, or erythrocyte sedimentation rate (ESR), is a blood test that can reveal inflammatory activity in your body. A sed rate test isn't a stand-alone diagnostic tool, but it may help your doctor diagnose or monitor the progress of an inflammatory disease.

It's elevated : But nonspecific. Any inflammatory process could cause this ranging from infections to autoimmune diseases to cancer. It's hard to better guide you without knowing why the test was ordered.