Cernostics will evaluate sections from a minimum of one biopsy level from every patient, and can evaluate as many biopsy levels as are obtained during an upper GI endoscopy procedure.  Tissue sections should be provided from the biopsy level with the highest grade histopathological diagnosis at a minimum.  Cernostics will test every submitted biopsy level.  When multiple biopsy levels are submitted Cernostics will provide an individual score for each biopsy level. The patient’s overall risk score will be based on the highest scoring biopsy level