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
| 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