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Struvite crystals (magnesium ammonium phosphate, triple phosphate)
usually appear as colorless, 3-dimensional, prism-like crystals
("coffin lids"). Occasionally, they instead resemble
(vaguely) an old-fashioned double-edged razor blade (lower frame).
Struvite crystals are the most common type in urine from dogs and cats. They are often seen in urine from clinically normal individuals. Though they can be found in urine of any pH, their formation is favored in neutral to alkaline urine. Urinary tract infection with urease-positive bacteria can promote struvite crystalluria (and urolithiasis) by raising urine pH and increasing free ammonia. |
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Last Updated: January 15, 1996