Lab Test : Osmolality, Urine

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Alternate:Urine Osmolality
Includes:Osmolality
Department:Chemistry
Phone:(937) 641-3428
SQ Code:OSMU
Available:Daily, 24 hours
Turnaround:Routine: 3 hours, STAT: 30 minutes
Specimen:Urine
Volume:0.2 mL
Container:Clean plastic urine collection container with lid
Temperature:Transport to lab within 30 minutes.
Rejection:Contaminated with feces.
Normal:50-1400 mOsm/kg
Uses:Useful in evaluation of concentrating ability of kidneys, electrolyte and water balance. Used in workup for renal disease, inappropriate secretion of antidiuretic hormone and diabetes insipidus.
Limitations:Simultaneous determination of serum and urine osmolalities may facilitate interpretation of results.
Method:Freezing point depression
 

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