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Alias Names: Bicarbonate / CO2 content
Methodology: pH Rate of Change
Edit Date: 6/11/2010
Performed: Daily
Released: Same day as tested
CPT Code: 82374
Specimen Collection Details
Collection: One 7.5 mL serum separator tube (SST). Also acceptable: One 4 mL green top tube (heparin) or one 4.5 mL plasma separator tube (PST). Draw tubes should be filled completely.
Handling: Allow to clot, centrifuge SST or PST within 2 hours of collection and transport in original tube. Immediately centrifuge green top tube and separate plasma from cells into a plastic vial for transport.
Stability: 48 hours refrigerated.
Standard Volume: 2 mL serum or plasma.
Minimum Volume: 0.5 mL serum or plasma.
Transport: Refrigerated.
Comments: Loss of CO2 from an uncapped tube is approximately 6 mmol/L after 1 hour.
See also: Basic Metabolic Panel (31300).
Rejection Criteria: Tubes other than those specified.

Reference Range:
<18 years 20-28 mEq/L
>18 years 22-31 mEq/L
Measurement of bicarbonate aids in the diagnosis and treatment of serious disorders associated with acid-base imbalance in the respiratory and metabolic systems.

PeaceHealth Laboratories