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.