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Laboratory Medicine

Test Directory / Urine Osmolality

Urine Osmolality

Urine monovette or white topped universal (no additives)

TestUrine Osmolality
Common AbbreviationsUOSM
Tube typeUrine monovette or white topped universal (no additives)
Clinical IndicationDetermination of serum and urine osmolality can be useful in the assessment of electrolyte and acid-base disorders. Comparison of serum and urine osmolalities can determine the status of renal water regulation in settings of severe electrolyte disturbances as might occur in diabetes insipidus or the syndrome of inappropriate anti-diuretic hormone. Osmolality may also be performed as part of a water deprivation test (used in the diagnosis of diabetes insipidus) or where there is suspicion of ingestion of an osmotically active substance such as ethanol, methanol or ethylene glycol.
Specimen TypeUrine
Sample typeRandom Urine
Minimum Volume1mL
Special PrecautionsNo special requirements
Stability5 days at room temperature, 4 days at 4°C and ? 14 days at -20°C
Turnaround TimeInpatient: 24 hours Outpatient/ GP: 24 hours
LaboratoryYork and Scarborough
Reference Interval300-900 mOsm/kg
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York Emergency Department (A&E)

The current entrance to the Emergency Department (A&E) is closed and a new entrance at the south of the building is in operation.

Arrive at Entrance 1, the main entrance to York Hospital signposted from Wigginton Road, and park in the multi-storey car park.  A new pedestrian exit has been created at the end of the car park. Follow the green line on the floor to the emergency department. Please see our website news for more information about arrivals to A&E.