Urine osmolality is an indicator of urine tonicity / concentration. Its primary indication is in the investigation of polyuria.
|Tube||08 (UR) - Urine|
|Additional Information||Primary polydipsia can cause a low urine osmolality and should be considered as a cause, particularly in psychiatric patients. Primary polydipsia will be associated with a dilutional hyponatraemia. With primary polydipsia, urine may remain dilute even with fluid restriction, but serum osmolality is often low or low to normal. A prolonged water deprivation test may be required. For information on water deprivation test, please see WDT page.|
|Turn Around||A&E: N/A
Day Case: N/A
In-Patient: 24 Hours
Out-Patient: 24 Hours
|Send to||Blood Sciences Cross Site|
|Contact||For further details please contact Leeds Pathology customer services: email@example.com.|
|Collection Con||Minimum volume - 250µl urine
Instructions for Lab Staff: Standard lab processing - No special requirements.
|Ref. Range Notes||Blood Sciences reference ranges are available through the useful information and links page: