PAEA Surgery End Of Rotation (EOR) Practice Exam

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A urine pH that is acidic would indicate the possibility of which type of renal stone?

  1. Calcium phosphate stones

  2. Struvite stones

  3. Uric acid stones

  4. Calcium oxalate stones

The correct answer is: Uric acid stones

An acidic urine pH is closely associated with the formation of uric acid stones. Uric acid stones tend to form when the urine is more acidic, leading to decreased solubility of uric acid, which can precipitate and form stones. Factors such as dehydration, a diet high in purines, and certain metabolic disorders can contribute to more acidic urine, thereby promoting the risk of uric acid stone formation. In contrast, the other types of stones are influenced by different conditions. For example, calcium phosphate stones typically form in alkaline urine, while struvite stones, associated with urinary tract infections caused by urease-producing bacteria, also develop in alkaline conditions. Calcium oxalate stones can form in a range of urine pH levels but are more commonly associated with neutral to slightly acidic urine. Therefore, an acidic urine pH most strongly indicates the presence of uric acid stones.

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