CO2 Test - part of the Comprehensive Metabolic Panel

The carbon dioxide (CO2) test measures the amount of carbon dioxide in the liquid part of your blood, called the serum.

In the body, most of the CO2 is in the form of a substance called bicarbonate (HCO3-). Therefore, the CO2 blood test is actually a measure of your blood bicarbonate level.

Changes in your CO2 level may suggest that you are losing or retaining fluid. This may cause an imbalance in your body's electrolytes.

CO2 levels in the blood are affected by kidney and lung function. The kidneys help maintain the normal bicarbonate levels.

This test is part of Cardio-Med's complete physical exam.

Normal Results

The normal range is 23 to 29 mEq/L (milliequivalents per liter).

What Abnormal Results Mean

Abnormal levels may be due to the following problems:

Lower-than-normal levels:

Higher-than-normal levels may be due to:

The following conditions may also alter bicarbonate levels:


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Adapted from the U.S. National Library of Medicine, National Institutes of Health

Physical Exam - Level I includes:

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Detailed blood pressure evaluation in both arms (seated) and in right arm (recumbent or lying down)      More . . .
Thyroid function profile      More . . .
Resting 12-lead Electrocardiogram (ECG/EKG) recording of electrical activity of the heart      More . . .
Cholesterol/
triglycerides profile      More . . .
Detailed clinical evaluation and consultation by Physician, not Nurse      More . . .
Comprehensive chemistry profile      More . . .