What it measures
Bicarbonate is the main buffer in the blood that keeps its acid level steady. The kidneys and lungs control it, so the result reflects how both are working. Some labs report it as total CO2.
Why people test it
- Part of a wider kidney and biochemistry panel.
- Used to look for a change in the blood's acid balance, for example with kidney disease, long-lasting vomiting or breathing problems.
Typical range
Ranges vary between labs, with the method used, age and sex, and your report shows the lab's own range. One NHS lab gives 22 to 29 mmol/L. Source: North Bristol NHS Trust, Severn Pathology: bicarbonate.
Finger-prick or vein?
Offered as a vein draw only, usually within a wider biochemistry panel. Delays and part-filled tubes can lower the result, as carbon dioxide escapes from the sample.