Educational information only. At Precursor, blood testing is requested and reviewed by a clinician and considered alongside your history and other markers, not as a stand-alone diagnosis. Testing is performed in NATA-accredited laboratories to ISO 15189 standards.

What is bicarbonate?

Bicarbonate is the body's main chemical buffer, the system that keeps your blood from becoming too acidic or too alkaline. Managed by the kidneys and lungs working together, it is a key part of maintaining the narrow pH range your cells need to function.

Why it matters

Bicarbonate is the practical everyday marker of your acid-base balance on a routine panel. Shifts up or down can reflect breathing, kidney function, or metabolic processes, so it offers a quiet but useful window on several systems at once.

What your results can mean

If your result is higher

A high bicarbonate can reflect certain metabolic or breathing-related shifts toward alkalinity, and is interpreted alongside your other electrolytes and clinical context.

If your result is lower

A low bicarbonate can accompany states that make the blood more acidic, from metabolic causes to kidney factors, and prompts a clinician to look at the wider picture.

Australian reporting and interpretation

Bicarbonate is reported in millimoles per litre (mmol/L). The RCPA harmonised adult interval is 22 to 32 mmol/L. Use the interval printed on your own report and interpret the result with your other electrolytes and clinical context.

Test your electrolytes with Precursor

Bicarbonate is read within the full electrolyte and metabolic picture. At Precursor it is measured as part of Full Advanced Bloods, a single clinician-reviewed blood draw covering your kidney, heart, metabolic, hormonal, liver, thyroid and nutrient markers together, giving you and your clinician a broad baseline to understand and track.