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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Ammonium Biurate Crystals

Ammonium biurate crystals commonly occur in the form of "thorn apples," as shown here, or in polyhedral shapes. They are deeply colored from a dark yellow to brown. They sometimes appear in clumps or clusters. This crystal occurs only in stale urine.