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Sodium, 24-Hour Urine with Creatinine
Test Code838
CPT Codes
82570, 84300<br><strong>This test is not available for New York patient testing.</strong>
Includes
CPT code 81050 may be added at an additional charge for volume measurement
Preferred Specimen
10 mL urine aliquot from 24-hour collection - no preservative
Minimum Volume
2 mL
Other Acceptable Specimens
Urine preserved with boric acid • Urine preserved with acetic acid • Urine preserved with HCl • Urinalysis transport tube (yellow-top, blue fill line, preservative tube)
Instructions
Record total volume and collection duration on specimen container and test requisition
Transport Container
Plastic urine container
Transport Temperature
Room temperature
Specimen Stability
Room temperature: 7 days
Refrigerated: 7 days
Frozen: 28 days
Refrigerated: 7 days
Frozen: 28 days
Methodology
Ion Selective Electrode (ISE) • Spectrophotometry (SP)
Setup Schedule
Set up: Daily; Report available: 2 days
Reference Range
See Laboratory Report
Clinical Significance
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. The creatinine value provides evidence of proper 24-hour urine collection.
