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Test Code NA Sodium

Methodology

Ion-Selective Electrode (ISE)

Performing Laboratory

St. Clair Hospital Laboratory

Specimen Requirements

Sample Type:   

  • Serum (free from hemolysis and gross lipemia, collected by standard venipuncture technique).
  • Plasma: Use only Li-heparin.
  • Urine: Urine samples for ISE (Na, K, Cl) do not require a preservative.  It is acceptable
    to analyze 24 hour urine collections for ISE when they are collected with 10 gm Boric Acid or 25 mL of 50% Acetic Acid as a preservative.

 

Reference Values

136-145 mmol/L
Critical values (automatic call-back):  <120 mmol/L or >160 mmol/L

Day(s) Test Set Up

Monday through Sunday