Open Access
A risk factor model of stone-formation
William G Robertson1
Institute of Urology and Nephrology, Royal Free and University College Medical School, University College London, 48 Riding House Street, London W1W 7EY, United Kingdom.
DOI: 10.2741/1181 Volume 8 Issue 6, pp.1330-1338
Published: 01 September 2003
(This article belongs to the Special Issue Kidney stones; their formation, removal and prevention)

A simple method for assessing the biochemical risk of forming uric acid and/or calcium-containing stones would be extremely useful for screening patients with urinary stone disease before and during their clinical management and follow-up. This paper describes a simplified procedure for calculating the overall biochemical risk of forming stones consisting of uric acid, calcium oxalate, calcium phosphate or various combinations of these common stone constituents making use of seven analyses normally carried out on 24-h urine samples in most Stone Clinics. The contribution of each risk factor towards the overall biochemical risk of forming stones (P(SF)) is calculated from a set of "risk curves" derived from frequency distributions of the seven risk factors measured in the 24-h urine samples from a large number of idiopathic stone-formers and their controls. PSF discriminates well between stone-formers and normal subjects and predicts the likely severity of the disorder in a given individual as defined by the number of stone episodes per year experienced by the patient concerned.

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William G Robertson. A risk factor model of stone-formation. Frontiers in Bioscience-Landmark. 2003. 8(6); 1330-1338.