Skip to main content

Sodium 24 hr Urine

Order Code U010
Turnaround Time 24-48 hours
Specimen Requirements
Specimen Source
Transport Container
(Specimen Container)

Plastic urine container, no preservative

Preferred Specimens
Collection Instructions
(Transport Temperature)
Transport at Room Temperature
Specimen Stability
Temperature Period
Room temperature 14 days
Refrigerated 14 days
Frozen 30 days
Special Instructions

10 mL urine aliquot from 24-hour collection – no preservative , Record total volume and collection duration on specimen container and test requisition.

Test Details
Ion Selective Electrode (ISE)
Clinical Significance

Assessing acid-base balance, water balance, water intoxication, and dehydration. The excretion of sodium varies with dietary intake. There is a diurnal variation of sodium excretion with excretion being greater during daytime than during the night. Decreased levels are seen in congestive heart failure, excessive sweating, diarrhea, pyloric obstruction, malabsorption and primary aldosteronism. Increased levels may be due to increased salt intake, failure of the adrenal glands, diabetic acidosis, salt losing renal disease, diuretic therapy and water deprivation dehydration.

Reference Ranges

52 – 380 mmol/L/24 hour