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Fig. 2. Urine pH and the risk of kidney stone formation. A urine pH that is close to 6.0 minimizes the risk of forming certain kidney stones. The urine pH that is most dangerous with respect to the formation of uric acid stones, is a value significantly lower than 6.0. In contrast, a urine pH significantly greater than 6.0 must also be avoided to minimize the risk of calcium phosphate (CaHPO4) stone formation.