The purpose of this study is to determine the rate of absorption of fluids (water or saline) during ureteroscopy and to assess the effects on electrolyte levels. The investigators also want to measure how much better the urologist can see the ureter based on the type of irrigation fluid that is used.
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Amount of irrigation fluid used during ureteroscopy
Timeframe: Measurement will be performed day of ureteroscopy
Change in serum sodium levels
Timeframe: Measurement will be performed day of ureteroscopy
Surgeon's rating of ureteroscopic visualization
Timeframe: Measurement will be performed day of ureteroscopy
Measurement of fluid clarity
Timeframe: Measurement will be performed day of ureteroscopy