Pathology tests database

Sample and container requirements

Plain Spot Urine Plain 24 hr Urine

Minimum volume required

100 µL urine

Special requirements

None

Patient preparation

None

Sample viability

Turnaround time

This assay is run throughout the day and night. The in-lab turnaround time is normally less than 24 hours. The test can be ordered as an urgent request.

Reference range

40 – 220 mmol/24 hr (Source: Abbott Diagnostics)

Clinical guidance

Urinary sodium, together with assessment of volume status, is useful in the differential diagnosis of hyponatraemia. Urinary sodium levels are also frequently ordered during the workup of acute renal failure with the fractional excretion of sodium used as an important marker in distinguishing pre-renal from post-renal failure. Please refer to LabTestsOnlineUK to learn more about sodium. https://labtestsonline.org.uk/tests/sodium-test

Notes