I have acid reflux, and I also have high eosinophil levels in my esophagus. My eosinophil levels were diagnosed by a bioposy performed during an upper endoscopy. I believe that eosinophil levels in the blood are totally different.
Try this website for a description of eosinophils in the blood:
http://www.nlm.nih.gov/MEDLINEPLUS/ency/article/003649.htm