Blood gases & acid-base

Total CO2 unit converter

Total carbon dioxide in blood, mostly bicarbonate (acid-base balance)

Also known as: CO2, total

Converter

Enter a value in any unit and all other units fill in.

mmol/L = mEq/L

Reference range

Unit	Adults
mmol/L = mEq/L	23 – 29

Source: MedlinePlus (NLM): CO2 blood test · Last reviewed: 2026-10-14

Note from the source: 23-29 mEq/L (= mmol/L); this is bicarbonate (MedlinePlus)

Frequently asked questions

What is the reference range of Total CO2?

For adults the range is 23 – 29 mmol/L (MedlinePlus (NLM): CO2 blood test). Reference ranges differ between laboratories and partly by sex and age; use the range printed on your lab report.

Which units are used for Total CO2?

Common units are mmol/L.

Related tests

Bicarbonate
Lactate
pCO2
pO2