<P> Urine osmolality is a measure of urine concentration, in which large values indicate concentrated urine and small values indicate diluted urine . Consumption of water (including water contained in food) affects the osmolality of urine . </P> <P> In healthy humans with restricted fluid intake, urine osmolality should be greater than 800 mOsm / kg, while a 24 - hour urine osmolality should average between 500 and 800 mOsm / kg . </P> <P> Urine osmolality in humans can range from approximately 50 to 1200 mOsm / kg, depending on whether the person has recently drank a large quantity of water (the lower number) or has gone without water for a long time (the higher number). Plasma osmolality with typical fluid intake often averages approximately 290 mOsm / kg H O in humans . </P>

Where is the final osmolarity of urine established