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The page below is a sample from the LabCE course Normal Peripheral Blood Cells (retired 2/12/2020). Access the complete course and earn ASCLS P.A.C.E.-approved continuing education credits by subscribing online.

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A basophil is also known as a basophilic granulocyte or a baso. Basophils are easily recognized because of their large, dark granules. The basophil's diameter is 9-15 microns, and its N:C ratio is approximately 1:3.
The color of the basophil cytoplasm is light pink to light blue or colorless, but the specific basophilic granules are prominent making the cytoplasm difficult to see. The granules are quite large and are purplish or bluish-black because they take up the basic components of Wright stain.