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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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Red Cell Casts

Red cell casts contain intact and disintegrated or crenated red blood cells. A red cell cast appears yellow or reddish-brown when a large number of cells are enclosed within the matrix of the cast. The presence of red cell casts in the urine indicates bleeding into the nephron.
In order for a cast to be considered a red cell cast, the outlines of the red cells must be clearly visible in at least one area of the cast.