Collection Notes: Avoid hemolyzed specimens. Do not allow serum to remain on the red cells after centrifugation. Grossly lipemic specimens should be cleared by ultracentrifugation.
Clinical Utility: Serum potassium levels are used to measure electrolyte balance.
Serum (1 mL)
Refrigerated 7 Days
Frozen 30 Days
Plasma (1 mL) Li Heparin
Refrigerated 7 Days
Frozen 30 Days
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