Difference between amorphous Urate and Phosphate

The distinction between amorphous urates and amorphous phosphates is often made on the urinary pH basis but the following can help in differentiation:

  • Phosphate is seen in alkaline pH
  • Urate is seen in acidic pH
  • The precipitate of phosphate is white
  • The precipitate of amorphous urate is pink (known as brick dust).
  • Amorphous phosphate is soluble in acetic acid
  • Amorphous urates are insoluble in acetic acid (by acidification it converts to uric acid)
Amorphous Urate or Phosphate Crystals

Amorphous Urate or Phosphate Crystals

 

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