Answer by
Ndlightningbug (132)
EOS stands for eosinophils,which are one type of white blood cell your body creates to fight foreign objects. An elevated level is often seen with an allergic reaction, a parasitic infection or possibly a deleterious reaction to a medication. Eosinophils can be elevated with certain diseases, and if necessary, an absolute eosinophil count will be done from a blood smear.