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Carbon Dioxide (CO2) Blood Test

* This is not a home test kit. You will need to visit a local lab for testing.

Also Known As

Bicarb, Bicarbonate Blood Test, Bicarbonate Test, Carbon Dioxide Content, CO2 Content, HCO3, Total CO2, TCO2

The Purpose of a Carbon Dioxide Blood Test

Biology 101 taught us that the body takes in oxygen when we inhale and lets out carbon dioxide when we exhale. This natural function helps us maintain a healthy level of carbon dioxide (in the form of the electrolyte called bicarbonate). But certain medical conditions—such as electrolyte imbalance, metabolic disorders, or kidney or lung issues—can interfere with the process. Checking the CO2 levels in the blood can help diagnose a health problem; this test is often part of a regular wellness visit, whether performed on its own or as part of a basic metabolic panel.

Carbon Dioxide, Total (310)
Carbon Dioxide, Total (001578)

What Does the CO2 Test Measure?

This blood test shows how much CO2 is in your body.

Who Should Take a Carbon Dioxide Test?

Blood work for CO2 is often ordered as part of an annual wellness checkup. There are certain symptoms that may also call for a carbon dioxide blood test, including fatigue, persistent diarrhea or vomiting, disorientation, weakness, and respiratory problems.

CO2 Lab Test Preparation

There’s nothing special you need to do before taking a CO2 test.

CO2 Blood Test Results

Generally, the normal range for carbon dioxide test results is 20 to 29 mmol/L, which stands for millimoles per liter. Results outside the range may require further investigation, such as lung or kidney testing. If you have questions about your CO2 lab test, contact Personalabs to set up a telehealth visit with an experienced, board-certified physician. If you don’t have any symptoms, you may want to monitor your CO2 levels every year to ensure they haven’t changed.

Where Can I Get Blood Work for CO2 Near Me?

Visit Personalabs if you want to check the CO2 levels in your blood. The CO2 blood test is part of our comprehensive collection of general health tests. Order the tests you want when you need data to make informed healthcare decisions. The process couldn’t be simpler:

Step 1: Purchase your test online. (Check to see if you need your doctor’s approval first in the state where you live.) Download the corresponding lab order; you’ll need to bring it to your testing appointment.

Step 2: Use our locator to find the Labcorp or Quest Diagnostics facility near you. (There are more than 4,000 to choose from across the United States.)

Step 3: Get your blood drawn. (Don’t forget to bring the lab order.).

Step 4: Find your test results in your secure Personalabs portal within 2 to 10 business days. (Contact us if you need help getting your results within a specific timeframe.)

It’s our goal to put the power over your health in your hands. Browse our complete collection of more than 400 tests, and take control of your healthcare decisions today.

Additional information


LabCorp, Quest

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Results can be provided in as little as 24-48 hrs. For more complex tests, please contact us for turn around times.


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