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C1 Esterase Inhibitor C Reactive Protein C Reactive Protein High Sensitivity CA 125 CA 153 CA 19.9 CA 27.29 Caffeine Calcitonin Calcium Calcium Ionized Carbamazepine Carbon Dioxide Carbon Monoxide Carcinoembryonic Antigen Cardiac Marker Panel Cardiovascular Risk Panel Carotene CCP Antibody CD4 Enumeration Celiac Disease Panel Centromere Antibody Cephalothin Antibody Cerebrospinal Fluid Ceruloplasmin Chemistry Panels Chlamydia Detection Chloride Cholesterol Cholinesterase Clindamycin Resistance Clostridium Difficile Coagulation Factor Assays Coagulation Factor Inhibitor Coagulation Screen Cold Agglutinin Titer Colloid Osmotic Pressure Complement Profile Complete Blood Count Congenital Adrenal Hyperplasia Cord Blood Gases Cord Blood Studies Corticotropin Releasing Hormone Stimulation Test Cortisol Cortisol in Critical Illness Cortisol Salivary Cortisol Urine Free Cortrosyn Stimulation Test Cotinine Creatine Kinase Creatine Kinase MB Creatinine Creatinine Clearance Crossmatch CRP Cryoglobulin Cryptococcal Antigen Cryptosporidium Antigen Crystal Identification Cushing Syndrome Cyclosporine Cystic Fibrosis Cytogenetic Studies Cytomegalovirus Antibody Cytomegalovirus Culture Cytomegalovirus PCR Qualitative Cytomegalovirus PCR Quantitative

Carbon Dioxide (CO2) Content

Carbon dioxide content or total CO2 is composed of bicarbonate ion, carbonic acid and dissolved carbon dioxide. Bicarbonate accounts for 90% of the total at physiological pH. CO2 content by itself is of little clinical use. Knowledge of the CO2 content together with pH and pCO2 is necessary for evaluation of acid base status. A low CO2 level may be associated with metabolic acidosis or compensated respiratory alkalosis. High CO2 content may be associated with metabolic alkalosis or compensated respiratory acidosis.

Reference range is 23 - 32 mEq/L. Critical values are < 10 mEq/L and >40 mEq/L.

Specimen requirement is one SST tube of blood.