Compliance with use of the Hydrate 1 system by patients with treated urolithiasis

Adequate hydration, leading to decreased urine osmolality and increased solubility of urinary constituents, is the cornerstone of urolithiasis prevention. Hydrate 1 is a system designed to allow patients to monitor urine osmolality by a simple colorimetric method, thereby adjusting their fluid intake. In 10 patients treated surgically for stone disease, the device worked well when used, guiding patients to increase intake appropriately. However, compliance was sporadic, determined principally by occupational or lifestyle constraints. Use of this system may have a place in that subset of patients with recurrent stone disease who have difficulty maintaining adequate urine volume.