Crystals in urine

Most often, crystals in routine urine sediment preps are without significance. Several different types can be seen in normal samples. A few specific types, however, can be important in certain clinical situations.

Shown at right are ammonium biurate ("thorny apple") crystals. These are frequently a pathologic finding (indicating liver insufficiency or portosystemic shunting) in dogs and cats. They can, however, be seen in normal Dalmations and English Bulldogs.

The sections on crystals in the Urine Sediment Atlas contain more detail regarding crystals in urine.

Ammonium biurate
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