What should you know about bicarbonate blood test?

Bicarbonate is a chemical buffer that helps keep blood acidity within a healthy range. It is commonly reported as part of an electrolyte or metabolic panel. The kidneys help regulate it, while the lungs influence acid balance by removing carbon dioxide.

A result outside the laboratory range does not diagnose one condition on its own. The clinician considers sodium, potassium, chloride, kidney markers, glucose, breathing, medicines and symptoms. Vomiting, diarrhoea, dehydration, kidney disease and changes in breathing can all affect acid-base balance for different reasons.

Follow the laboratory instructions about fasting, drinking water and regular medicines. Tell the clinician about supplements, diuretics, antacids, kidney problems, prolonged vomiting or diarrhoea, and any breathing disorder. A repeat test or additional blood-gas testing may be suggested when the result does not fit the clinical picture.

Do not try to correct the number with bicarbonate tablets or major diet changes without medical advice. The useful next step is treating the underlying cause, which may involve fluids, medicine or management of kidney or lung disease.

Seek urgent care for deep or rapid breathing, severe weakness, repeated vomiting, confusion, fainting, chest pain, or marked drowsiness. Immediate assessment is especially important when these symptoms occur with dehydration, a serious infection or known kidney disease.

Ask why the test was ordered, whether the result is mildly or markedly outside range, which other results matter, and whether another sample or blood-gas test is needed.