Waxy Casts

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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.

Learn more about The Urine Microscopic: Microscopic Analysis of Urine Sediment (online CE course)
Waxy Casts

Waxy casts appear as cylinders of smooth, highly refractile material. They are homogeneous with sharp, defined edges, and usually squared-off ends. Cracks may occur within the cast, giving it a segmented appearance. Waxy casts are believed by some to be the final stage of degeneration of the fine granules of granular casts. Since the granules need time to degrade, this finding implies localized nephron obstruction.

Waxy casts are seen in chronic renal failure, and acute and chronic renal allograft rejection.
Unusually broad waxy casts are sometimes referred to as renal failure casts. These very broad casts are created in the dilated tubules seen in end-stage renal disease.