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.
Ion-selective electrode (ISE); enzymatic
Hemolysis and gross lipemia, urine with additives
Room Temperature: 14 days Refrigerated: 14 days
Serum, gel separator, SST, 24 hour Urine (no additives)
0 - 999
136 mmol/L - 145 mmol/L