- Tyrosine crystals are abnormal in urine
- Appearance: colorless to yellow-brown single needles. Also seen as sheaves or rosettes.
- Tyrosine crystals may be seen in tyrosinemia and in certain liver disorders in which amino acid metabolism is impaired.
- The presence of tyrosine crystals is usually accompanied by a positive biochemical test for bilirubin and are often accompanied by the presence of leucine crystals in the sediment.