Crystalluria refers to cloudy urine when the cause of cloudiness is due to crystals found in the urine when performing a urine test. Crystalluria is considered often as a benign condition and as one of the side effects of sulfonamides and penicillins.

Struvite crystals found in a urinalysis

Clinical significance

It can be an indication of urolithiasis.

It can be associated with cystinuria.[1] It leads to formation of stones.


  1. Daudon M, Cohen-Solal F, Barbey F, Gagnadoux MF, Knebelmann B, Jungers P (July 2003). "Cystine crystal volume determination: a useful tool in the management of cystinuric patients". Urol. Res. 31 (3): 207–11. doi:10.1007/s00240-003-0319-0. PMID 12748836.

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