Common causes of Urine discolouration


Real and Artifact Urine Cast

  (A) – Cast Artifact (B) – Real Hyaline Cast  

False urine dipstick results duo to strong oxidizing agent

  This patient had a Urinalysis, the dipstick results were as follow: Glucose – 100 mg/dL Bilirubin – neg Ketone – neg Specific Gravity – 1.010 Blood – ...

Urine Crystals Forms


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

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