Alternative names, keywords


Samples required

Clotted blood (gold cap, 5 mL tube). Smaller tubes are available for paediatric samples.

Transport to lab within 4 hours.

Test indications

Useful test for metabolic acidosis in the absence of COAD avoiding arterial puncture.

Factors affecting test performance/ results

In very rare cases, gammopathy, in particular type IgM (Waldenström’s macroglobulinemia), may cause unreliable results.

Results should always be assessed in conjunction with the patient’s medical history, clinical examination and other findings.

Reference range

22 - 29 mmol/L
Source: Roche Cobas® Bicarbonate kit insert 09-2014, V9.0

Turnaround time

Same day (within 2h if urgent)


Biochemistry (Automation)