Which urinary stone is most associated with a urinary tract infection?

Which urinary stone is most associated with a urinary tract infection?

• A. Calcium oxalate crystal
• B. Struvite crystal
• C. Calcium carbonate crystal
• D. Cystine crystal

Answer: (B)

Struvite crystals are the type most linked to urinary tract infections because they form when bacteria in the urine produce an enzyme called urease. Urease breaks down urea into ammonia, which makes the urine alkaline. In alkaline urine, magnesium, ammonium, and phosphate readily combine to create magnesium ammonium phosphate crystals, known as struvite. These crystals can grow into stones and are classically associated with UTIs, especially with urease-producing bacteria. Other crystal types—calcium oxalate, calcium carbonate, and cystine—arise from different metabolic or genetic factors and are not specifically driven by infection. Struvite stones often appear as coffin-lid shaped crystals under the microscope and can be a common infection-related stone in veterinary patients.

Struvite crystals are the type most linked to urinary tract infections because they form when bacteria in the urine produce an enzyme called urease. Urease breaks down urea into ammonia, which makes the urine alkaline. In alkaline urine, magnesium, ammonium, and phosphate readily combine to create magnesium ammonium phosphate crystals, known as struvite. These crystals can grow into stones and are classically associated with UTIs, especially with urease-producing bacteria. Other crystal types—calcium oxalate, calcium carbonate, and cystine—arise from different metabolic or genetic factors and are not specifically driven by infection. Struvite stones often appear as coffin-lid shaped crystals under the microscope and can be a common infection-related stone in veterinary patients.