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Sodium
Test Code836
CPT Codes
84295
Preferred Specimen
1 mL serum collected in a serum separator tube (SST)
Minimum Volume
0.5 mL
Other Acceptable Specimens
Plasma collected in: sodium or lithium heparin (green-top) tube
Transport Temperature
Room temperature
Specimen Stability
Room temperature: 7 days
Refrigerated: 7 days
Frozen: 28 days
Refrigerated: 7 days
Frozen: 28 days
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Gross hemolysis • Anticoagulants other than heparin
Methodology
Ion Selective Electrode (ISE)
Setup Schedule
Set up: Daily; Report available: Next day
Reference Range
135-146 mmol/L
Clinical Significance
Sodium measurements are useful in the diagnosis and treatment of aldosteronism, diabetes insipidus, adrenal hypertension, Addison's Disease, dehydration, inappropriate antidiuretic hormone secretion, or other diseases involving electrolyte imbalance.
