Show Main Menu +
Eosinophils measure 10-17 microns in diameter, and have abundant, slightly basophilic cytoplasm containing numerous coarse, reddish-orange cytoplasmic granules. Most eosinophils have bilobed nuclei, but occasional forms with trilobed nuclei may be seen. The chromatin is condensed. Eosinophils usually account for a minor subset of peripheral blood leukocytes. Increased numbers of eosinophils can be seen in parasitic infections, allergic conditions, drug hypersensitivity, myeloid neoplasms, and lymphoproliferative disorders.