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.
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References
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Briellmann, T., Hering, F., Seiler, H. et al. The oxalate-tolerance-value: A whole urine method to discriminate between calcium oxalate-stoneformers and others. Urol. Res. 13, 291–295 (1985). https://doi.org/10.1007/BF00262659
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DOI: https://doi.org/10.1007/BF00262659