I just got the results of a 24-hour urine osmolality test" Osmolality, Urine: 250.0 mOsmol/kg [ 0 - 289.9] That range can't be right, can it? A quick search tells me the range is usually 300-900 or 500-800 milli-osmoles / kg. I took in 111 oz. (3282 ml) of fluids that day and peed out more than that: I filled a 4-liter container to the brim. That was the minimum I could drink and not feel constant thirst. I was dehydrated by evening, which tells me that I usually drink more. The greatest amount I peed at one go was 2/3 quart, around 2 or 3 am.