Test Directory

Sodium

Loinc

Expected Turnaround

24 hours

Information

Sodium is the major extracellular cation and functions to maintain fluid distribution and osmotic pressure. Some causes of decreased levels of sodium include prolonged vomiting or diarrhea, diminished reabsorption in the kidney and excessive fluid retention. Common causes of increased sodium include excessive fluid loss, high salt intake and increased kidney reabsorption.

Collection Information

Methodology

Ion-selective electrode (ISE); enzymatic

Limitations

Rejection Criteria

Hemolysis and gross lipemia, urine with additives

Specimen Stability

Room Temperature: 14 days Refrigerated: 14 days

Alias

Sodium

Container Type

Serum, gel separator, SST, 24 hour Urine (no additives)

Minimum Volume

1 ML

Age Range

0 - 999

Sex

Generic

Units of Measure

mmol/L

Reference Range

136 mmol/L - 145 mmol/L

Panic Range

<121 mmol/L
>159 mmol/L