The following table lists common crystals found in the urine sediment. Crystals that have no clinical significance must be identified and differentiated from those that can be an indication of a metabolic disorder or other clinically significant conditions.
Uric acid | Acidic | Yellow - brown |
Calcium oxalate | Acidic/neutral | Colorless |
Amorphous urates | Acidic | Yellow - brown |
Triple phosphate | Alkaline | Colorless |
Ammonium biurate | Alkaline | Yellow - brown |
Amorphous phosphate | Alkaline/neutral | White - colorless |
Calcium carbonate | Alkaline | Colorless |