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Electrolytes (24 hour)

Alias: N/A

Discipline: Clinical Chemistry

Test information: Urinary sodium is useful in the differential diagnosis of hyponatramia.
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.
Urinary potassium may be ordered in the workup of hypokalemia.
In case of GI loss of potassium, the urine potassium will be low.
In case of renal loss of potassium, the urine potassium levels will be high.
Decreased levels of urine potassium are also seen in hypoaldosteronism and adrenal insufficiency.

Specimen Type(s)
  • Urine;
Other Acceptable Specimen Type(s)
Specimen Container - Adult
  • 24hr Urine - Black Bottle (Plain);
Specimen Container - Paediatric
  • Plain Universal;
  • N/A;
Part of a test profile?
Electrolytes (Full versions)
Volume (min) of sample to be sent to laboratory
24 hour urine
Patient Preparation, Sample Handling and Transport
24 hour urine containers can be ordered through Clinical chemistry, contact us on 01872 252540 or via ICE mail or to request a container, a patient information leaflet will also be included.
Maximum add on time
5 days refrigerated
Units and Reference Ranges / Interpretation
UKAS number
UKAS accredited test?

If you have any queries about a test or results interpretation please contact us.

Last updated: 03-05-2024