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Methodology: Indirect Potentiometry, pH Rate of Change
Edit Date: 1/14/2006
Components: Carbon Dioxide (CO2) Content; Chloride (Cl); Potassium (K); Sodium (Na)
Performed: Daily
Released: Same day
CPT Code: 80051
Specimen Collection Details
Collection: One 7.5 mL serum separator tube (SST). Also acceptable: One 4 mL green top tube (heparin). Do not draw from an arm receiving an intravenous infusion. Patient should avoid exercising forearm before collection, which can cause an elevation in the potassium level.
Handling: Centrifuge SST and transport in original tube. Centrifuge green top tube within 30 minutes of collection and separate plasma into a plastic tube for transport. Refrigerate.
Standard Volume: 2 mL serum or plasma.
Minimum Volume: 0.5 mL serum or plasma.
Transport: Refrigerated.
Rejection Criteria: Gross hemolysis; tubes other than those specified.

Components Sodium (Na) Potassium (K) Chloride (Cl) CO2 Content (CO2)
Reference Range 135-145 mEq/L 3.5-5.2 mEq/L 95-109 mEq/L <18 years:20-28 mEq/L; >18 years: 22-31 mEq/L

PeaceHealth Laboratories