- Leucine crystals are abnormal in urine
- Appearance: yellow-brown spheroids with concentric rings around the outer edge and radial striations in the center.
- Leucine crystals may be seen in liver disorders in which amino acid metabolism is impaired.
- The presence of leucine crystals is often accompanied by a positive biochemical test for bilirubin and is often accompanied by tyrosine crystals in the same sediment.


