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Sodium, Random Urine without Creatinine
Test Code14522
CPT Codes
84300
Preferred Specimen
10 mL random urine, no preservative in a plastic leak-proof container
Minimum Volume
2 mL
Other Acceptable Specimens
Urinalysis transport tube (yellow-top, blue fill line, preservative tube)
Transport Temperature
Room temperature
Specimen Stability
Room temperature: 14 days
Refrigerated: 14 days
Frozen: 60 days
Refrigerated: 14 days
Frozen: 60 days
Methodology
Ion Selective Electrode (ISE)
Setup Schedule
Sets up 7 days a week.
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 and water deficient dehydration.