Osmolality (Serum/Urine)

Test/Investigation

Osmolality (Serum/Urine)

Site(s) or Laboratory offering Test/Investigation

NNUH, QEH, JPUH

Units

mmol/kg

Comments/Precautions

Estimation of osmolar gap, investigation of hyponatraemia. Urine osmolality should always be interpreted with reference to a paired serum osmolality.

Sample type

Serum/random urine

Turnaround times (TAT) Urgent/Routine/GP or OPD

1 hour / 4 hour / by 8am next day

Reference intervals (adult unless stated)

Serum osmolality 275 – 295 mmol/kg
Urine osmolality – see comment on report or contact laboratory

If UKAS Accredited Test indicate at which site

Y NNUH

Source

Pathology Harmony [Pathology Harmony Group, Clinical Biochemistry Outcomes, January 2011] https://www.acb.org.uk/asset/EEA82309-7E93-417D-9B8991B0C65C52FB/; accessed 09/11/2021