Test Directory

3287 Sodium, 24 Hour Urine

Specimen Type
Specimen Stability
Reference Range
24 Hour Urine
14 Days
40-220 mEq/24hr

Specimen Requirements

Specimen Type: 24 Hour Urine
Container: 1 24 Hour Urine Container (without Preservative)
Temperature: Refrigerated
Preferred Vol: 1.00 mL
Min Vol: 20.00 mL


Ion-Selective Electrode (ISE)



Turn-Around Time



24 Hr Urine collection (No preservatives). Must indicate total volume on container and requisition.

Clinical Utility

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.

CPT Codes

81050, 84300

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