The term "brick dust" urine refers to the gross appearance of the urine specimen.


A brick dust urine shows small particles of reddish or brownish material in the sediment.


Differential diagnosis:

(1) uric acid and/or phosphate microurolithiasis

(2) drug crystals

(3) fragmented blood clot (usually in the setting of recent hematuria)


Brick dust urine is seen due to urates in breast-fed neonates, especially if they are dehydrated.


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