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Renal tubular acidosis, a kidney condition that makes the urine more acidic. Kidney stones form more easily in acidic urine. ... Uric acid, calcium oxalate, and cystine stones form more readily in acidic urine, so this prevention strategy hinges on keeping the urine slightly alkaline.
In turn, the calcium in the blood is filtered by the kidney and can lead to kidney stone formation. Our urine pH reflects the net renal acid load generated in our body, which comes primarily from eating acid-generating foods. Therefore urine pH is highly reflective of our diet.