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The page below is a sample from the LabCE course The Urine Microscopic: Microscopic Analysis of Urine Sediment. Access the complete course and earn ASCLS P.A.C.E.-approved continuing education credits by subscribing online.

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Renal Tubular Epithelial (RTE) Cell Casts

RTE cell casts appear as clear cylinders containing RTE cells. These casts indicate tubular damage. In some RTE cell casts, the RTE cells may appear in rows, indicating that the epithelium of an entire tubule has sloughed off.

Renal epithelial cell casts may be difficult to distinguish from WBC casts especially if the casts have begun to degrade. Phase-contrast microscopy or supravital stains may aid differentiation. The RTE cell cast shown in the image on the right was stained with supravital stain.