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Bicarbonate

HCO3- Serum Bicarbonate Total CO2 TCO2
Serum (SST) mmol/L

About this test

Major extracellular buffer; reflects metabolic component of acid-base balance. Part of U&E panel.

Reference Ranges

Sex Age Range Notes
All ≥ 18 yrs 22 – 29 Adult

Clinical Interpretation

Low / Decreased
Low — metabolic acidosis (DKA, lactic acidosis, renal failure, diarrhoea, RTA).
High / Increased
High — metabolic alkalosis (vomiting, diuretic use, primary hyperaldosteronism).

Related Tests

Sodium Potassium Chloride Lactate
Specimen
Serum (SST)
Reporting Unit
mmol/L
Category
🧪 Clinical Biochemistry

⚠ Clinical Note
Reference ranges are indicative. Always interpret results in the context of the individual patient and local laboratory reference intervals, which may vary.