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Renal reserve in patients with solitary kidneys.

The first part of this article focuses on the risk of functional deterioration in subjects with solitary kidneys; the long-term clinical outcome of various subgroups of patients is reviewed. Thereafter, the pathophysiology of the renal functional reserve in subjects with a 50% reduction in renal parenchyma and the results coming from studies eliciting the renal reserve in these subjects are summarized. Finally, the clinical significance of the renal functional reserve and its usefulness in clinical practice are critically discussed.