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Calculation Of Urine Osmolality . Normal values are as follows: A serum osmolality of 285 mosm usually correlates with a urine specific gravity of 1.010. Approach to hyponatremia from www.slideshare.net The contribution of the ions can be fortuitously estimated as 2 × [na] (in mmol/l), for three reasons: 50 to 1200 mosm/kg (50 to 1200 mmol/kg) 12 to 14 hour fluid restriction: Enter urine urea in mg/dl.