Osmolality (urine)
Urine osmolality is an indicator of urine tonicity / concentration. Its primary indication is in the investigation of polyuria.
| Tube | 08 (UR) - Urine |
|---|---|
| ID | Tests&Tubes0087 |
| 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 GP: N/A |
| Send to | Blood Sciences Cross Site |
| Contact | For further details please contact Leeds Pathology customer services: leedsth-tr.pathologycustomerservice@nhs.net. |
| Collection Con | Minimum volume - 250µl urine Instructions for Lab Staff: Standard lab processing - No special requirements. |
| Sample REQ | Urine |
| Ref. Range Notes | Blood Sciences reference ranges are available through the useful information and links page: https://www.leedsth.nhs.uk/a-z-of-services/pathology/blood-sciences/useful-information-and-links/ |
| Units | mOsmol/kg |
| Telepath | OSMU1L |
| ICE Codes | LOSMU |
