{"id":"bicarbonate","name":"Bicarbonate (Total CO2)","shortName":"Bicarbonate","aliases":["Bicarbonate","CO2","Total CO2","Carbon Dioxide, Total","Carbon Dioxide","HCO3","CO2, Total","TCO2","Bicarbonate, Serum","Serum Bicarbonate","CO2, Serum","Serum CO2","CO2 Content","Carbon Dioxide Content","Total Carbon Dioxide","Bicarb","Carbon Dioxide, Total, Serum","Bicarbonato","Hydrogencarbonat"],"abbreviations":["HCO3","HCO3-","TCO2","tCO2","CO2"],"loinc":[{"code":"2028-9","primary":true},{"code":"1963-8","primary":false},{"code":"20565-8","primary":false}],"specimen":"serum-or-plasma","units":[{"ucum":"mmol/L","display":"mmol/L"},{"ucum":"meq/L","display":"mEq/L"}],"referenceRanges":[{"population":"13+","low":20,"high":29,"unit":"mmol/L","unitDisplay":"mmol/L","note":"Labcorp prints 20–29 mmol/L for anyone over 12 (men and women alike). Mayo Clinic Laboratories prints 22–29 for adults, so the low end differs by lab. Use the range printed on your own report first.","sources":[{"title":"Carbon Dioxide, Total (test 001578)","url":"https://www.labcorp.com/tests/001578/carbon-dioxide-total","publisher":"Labcorp"},{"title":"Bicarbonate, Serum (test ID HCO3)","url":"https://www.mayocliniclabs.com/test-catalog/overview/876","publisher":"Mayo Clinic Laboratories"}]}],"review":{"status":"ai-verified","label":"AI-verified against cited sources. Awaiting expert review","lastReviewed":"2026-10-03"},"summary":"Bicarbonate, often printed as CO2 or total CO2, gives a clue about your body's acid-base balance. It is part of most routine blood panels.","url":"https://bloodtesttracker.com/markers/bicarbonate","notice":"Information, not medical advice. Ranges differ between labs, so the range on your own report is the one your result is judged against."}