Why are WBCs observed under oil immersion lens ?
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This area of the smear is usually scanned at low power to identify low numbers of potentially diagnostic cells (e.g. blasts in a leukemia), infectious agents (e.g. trypanosomes, microfilaria), and certain RBC changes (hypochromasia, agglutinates).
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White blood cells (WBCs), also called leukocytes or leucocytes, are the cells of the immune system that are involved in protecting the body against both infectious disease and foreign invaders. All white blood cells are produced and derived from multipotent cells in the bone marrow known as hematopoietic stem cells.
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