Hippuric Acid Crystals

  Hippuric Acid crystals are rarely seen – yellow-brown or colorless elongated prisms or plates and maybe so thin to resemble needles and they often cluster together it’s ...

Ammonium biurate Crystals

  Appearance: Ammonium biurate crystals are yellowish-brown and can be seen in a “thorn apple” shape (round with thorny projections) or in spherical form. Chemical ...

Causes of False-Positive and False-Negative Urinalysis Results


YEAST in urine sediment


Fatty Casts

Fatty casts are identified by the presence of refractile lipid droplets within the protein matrix of the cast. The background matrix of the cast may be hyaline or granular in nature. ...

Urinalysis Elements

Struvite crystals

Struvite crystals (magnesium ammonium phosphate, triple phosphate) usually appear as colorless, 3-dimensional, prism-like crystals (“coffin lids”). Occasionally, they instead ...

Casts in Urine

waxy casts in urine

Waxy casts have a smooth consistency but are more refractile and therefore easier to see in a regular wet sediment preparation of urine compared to hyaline casts. They commonly have ...

Calcium carbonate crystals

Calcium carbonate crystals are variably sized crystals that frequently appear as large spheroids with radial striations. They can also be seen as smaller crystals with round, ovoid, ...

some casts found in urine

WBCs cast in urine

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