Increased amounts of eosinophils in body fluid may be seen with asthma, parasitic infection, and allergic or foreign body reactions.
Appearance
Eosinophils have coarse refractile reddish-orange granules. They appear essentially the same as they do in peripheral blood.
Lookalikes
Cytocentrifugation may make granules in neutrophils appear larger which may be confused for eosinophils. However, neutrophil granules will not have the refractile quality seen in eosinophils or the vibrant reddish-orange coloring.
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