The page below is a sample from the LabCE course Red Blood Cell (RBC) Morphology. Access the complete course and earn ASCLS P.A.C.E.-approved continuing education credits by subscribing online.

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Normal RBC Size

A normal RBC is 6.7-7.8 µm in diameter, approximately the same size as the nucleus of a small lymphocyte, which is often used as a guideline when determining the size of the red cells on a slide. Notice that most of the red cells in this field are about the same size as the nucleus of the lymphocyte shown in the image.