Hard to say: While a very high absolute eosinophil count (usually above 1000-1500) for several months can lead to problems, a count of 800 by itself is unlikely to be significant. It can be caused by allergies, asthma, certain infections, reactions to medications, etc. Talk with your doctor about other symptoms you are having. If the count stays for high for a long time, see a hematologist or immunologist.
Answered 1/12/2019
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