The oxalate-tolerance-value: A whole urine method to discriminate between calcium oxalate-stoneformers and others

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Abstract
Summary In undiluted urine portions the oxalate-concentration required for precipitation (≙ oxalate-tolerance) can be obtained by titration with sodiumoxalate and turbidimetric detection. The corresponding urinary calcium-concentration was measured and the two values plotted against each other. With regard to a standard-curve (measurements in synthetic urine) different behaviour between urines of stone forming patients and others can be observed.