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24 Hour Urine - Sodium

The kidney is central to the regulation and conservation of electrolytes in the body. Urinary sodium (Na+) excretion varies with dietary intake, and there is a large diurnal variation with the rate of Na+ excretion during the night being only 20% of the peak rate during the day. Urine sodium testing is used on the evaluation of acid-base abnormalities, water balance, water intoxication, and dehydration.

Service Information

Information Table
Performing Unit Outpatient Department
Contact Number of Unit (02) 8771 9000 local 8006
Operating Hours of Performing Unit Monday - Saturday, 6 am - 6 pm; Sunday, 6 am - 5 pm
Scheduling Process Walk In
Does It Require Doctor's Order? Yes
Estimated Turnaround Time for Results 3 hours

Patient Preparation Guidelines

  1. At the start of the collection, empty your bladder and discard the first urine.
  2. Collect all urine passed over the next 24 hours.
  3. Record the start and end date and time of the collection.
  4. Keep the urine container refrigerated or stored in an ice chest throughout the collection period."
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