Bicarbonate

The Bicarbonate test measures the level of bicarbonate (HCO₃⁻), the body’s primary buffer that helps maintain normal blood pH (7.35–7.45) and acid-base balance. Bicarbonate is formed during carbon dioxide (CO₂) metabolism, transported in the blood, and regulated mainly by the kidneys and lungs. The kidneys adjust bicarbonate levels through reabsorption or excretion, while the lungs help regulate it by removing CO₂. It provides important information about acid-base status, kidney function, lung function, and overall metabolic health.

Who should get this test done?

This test is recommended for individuals who:

●     Have diabetes with suspected diabetic ketoacidosis (DKA).

●     Have chronic kidney disease (CKD) or chronic respiratory disorders such as COPD, emphysema, or severe asthma.

●     Experience persistent vomiting, diarrhea, or other conditions causing acid-base imbalance.

●     Have electrolyte abnormalities (e.g., potassium or sodium disturbances).

●     Have unexplained fatigue, weakness, rapid breathing, or confusion suggestive of an acid-base disorder.

Why consider this test?

This test helps:

●     Assesses the body’s acid-base balance and detects metabolic acidosis or alkalosis.

●     Helps diagnose and monitor metabolic acidosis (e.g., DKA, lactic acidosis, CKD, severe diarrhea).

●     Helps diagnose and monitor metabolic alkalosis (e.g., vomiting, diuretic use, hyperaldosteronism).

●     Evaluates kidney function and renal acid-base regulation.

●     Helps assess electrolyte imbalances, particularly involving potassium and chloride.

More Information

Bicarbonate is part of the body’s acid-base buffering system and must be interpreted alongside pH, CO₂, and electrolyte levels. Acid-base disorders involve compensation between the lungs and kidneys; abnormalities in one system often trigger adjustments in the other. In chronic kidney disease (CKD), persistently low bicarbonate can accelerate kidney damage, worsen bone and muscle health, and increase cardiovascular risk; correction may be required. In diabetic ketoacidosis (DKA), bicarbonate levels reflect the severity of acidosis and help guide treatment decisions. Accurate interpretation requires consideration of the overall clinical picture rather than bicarbonate levels alone.

Other names:

●     Serum Bicarbonate Test

●     CO2 Test

●     Total CO2, Test

●     HCO3-, Test

●     Serum CO2, Test

●     Venous Bicarbonate Test

●     Bicarb Test

●     Carbon Dioxide Content Test

●     Acid-Base Balance Test

●     Electrolyte Panel - Bicarbonate Component

●     Serum Total Carbon Dioxide Test

●     Blood Buffer Test