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  • Title: Value of routine citrate analysis and calcium/citrate ratio in calcium urolithiasis.
    Author: Höbarth K, Hofbauer J.
    Journal: Eur Urol; 1991; 19(2):165-8. PubMed ID: 2022221.
    Abstract:
    24-hour urinary citrate excretion was measured in 176 calcium oxalate stone formers and 100 normal controls. A statistically significant difference (p less than 0.03) could be found between the two groups. When stone formers were divided into a group of 69 patients with recurrent calcium urolithiasis (RCU) and a group of 106 patients with a single stone episode, the latter did not differ from the control group, while in RCU a significantly lower citrate excretion compared with controls (p less than 0.005) could be found. Thus, patients with RCU could benefit from alkali citrate prophylaxis. A female-male difference in citrate excretion could not be found in either the control group or stone formers. Recurrent stone formers presented a significantly higher calcium/citrate ratio compared with controls, which would indicate an increased risk for stone formation. The value of routine citrate analysis is limited, however, by the great, variability of citrate levels in stone formers and controls.
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