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The BRI has been shown to discriminate between calcium oxalate stone formers and controls. BRI is the ratio of the concentration of ionized calcium and the amount of oxalate that must be added to 200 ml urine to initiate crystallization. Higher BRI values are predictive of being a stone former and a value of 1.0 has been found to be the cutoff value to distinguish stone formers and controls. It is...
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