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Carbon dioxide test for monitoring lung and kidney function, fluid retention

Blood Test for Breathing Issues and Energy Imbalances

Carbon Dioxide

Google
3,138 reviews
  • Reveal how well your lungs are functioning
  • Clarify if your body is retaining fluids
  • Detect imbalances affecting your energy levels
First results as soon as overnight*

90 day happiness guarantee

We stand behind our service

Prescription & fees included

Go directly to the lab, no extra fees

Easy to understand results

With friendly doctor's notes & guidance

Fast & convenient

Lab visit as quick as 10 mins in & out

90 day happiness guarantee

We stand behind our service

Prescription & fees included

Go directly to the lab, no extra fees

Easy to understand results

With friendly doctor's notes & guidance

Fast & convenient

Lab visit as quick as 10 mins in & out

What's this test for?

This test is ideal if you're experiencing unexplained fatigue, shortness of breath, confusion, or irregular breathing patterns. It helps identify whether your lungs and kidneys are functioning properly and if your body's acid-base balance is off. Many people use this test when they suspect their symptoms are related to respiratory or kidney issues but want concrete answers about what's affecting their energy levels.

How should I prepare for this test?

No special preparation is typically required for a CO2 blood test. You can eat and drink normally before the test, and there's no need to fast. However, let your healthcare provider know about any medications you're taking, as some drugs can affect CO2 levels. The test is a simple blood draw that takes just a few minutes.

What's included in this test?

Carbon Dioxide

This test measures the level of carbon dioxide in your bloodstream, which is a key indicator of how well your lungs are removing CO2 when you breathe and how effectively your kidneys are maintaining your body's pH balance. Abnormal levels can signal respiratory problems, kidney dysfunction, or metabolic imbalances that affect your energy, breathing, and overall health. This measurement provides important insight into your body's acid-base balance and organ function.

What happens after I get my results?
You'll receive detailed doctor notes in simple language explaining what your CO2 levels mean for your lung and kidney function and overall energy balance. These notes include personalized recommendations like hydration strategies, breathing exercises, lifestyle changes, or whether you should follow up with a specialist. You'll also get the standard lab report and can track your CO2 levels over time using our trends feature to see how your interventions are working.
When will I get my results?
Results for the Carbon Dioxide test are typically available within 1-2 business days after your sample reaches the lab. You'll receive an email notification as soon as your results are ready, and you can access them securely through your online account. If your results show significant abnormalities, you may want to discuss them with your healthcare provider.
Who should consider this test?
This test is important for people experiencing breathing difficulties, unexplained fatigue, or confusion. It's also recommended if you have kidney disease, lung conditions like COPD or asthma, diabetes, or heart problems. Anyone taking medications that affect breathing or kidney function, or those recovering from serious illness, should consider monitoring their CO2 levels.
What symptoms indicate I may need this test?
Common symptoms that might indicate you need a CO2 test include shortness of breath, rapid or irregular breathing, excessive fatigue, confusion or disorientation, muscle weakness, and frequent headaches. You might also consider this test if you experience nausea, vomiting, or notice swelling in your legs or feet, as these can signal acid-base imbalances.
How can I naturally support healthy CO2 levels?
Maintaining healthy CO2 levels starts with staying well-hydrated throughout the day and practicing deep breathing exercises to improve lung function. Regular cardiovascular exercise strengthens your respiratory system, while maintaining a balanced diet supports kidney health. If you have underlying conditions like kidney disease or respiratory issues, following your treatment plan and avoiding smoking are essential.
What does high CO2 mean?
High CO2 levels can indicate your lungs aren't removing enough carbon dioxide when you exhale, which may be related to respiratory conditions like COPD, asthma, or sleep apnea. It can also suggest metabolic alkalosis, where your body has too much base (not enough acid). This can cause symptoms like confusion, muscle twitching, and irregular heartbeat.
What does low CO2 mean?
Low CO2 levels may indicate metabolic acidosis, where your blood is too acidic, which can be caused by kidney disease, uncontrolled diabetes, or severe diarrhea. It can also result from hyperventilation or respiratory alkalosis. Symptoms might include rapid breathing, fatigue, confusion, and nausea. Low levels require medical attention to identify and address the underlying cause.
How’s this work?
Getting your blood test with us is easy, private & backed by the power of science.

Long story short:
  1. In the test options, use the filters or search box to narrow your choices and find the test you want.
  2. If you need a hand navigating through options, text our super friendly support team at 754-799-7833, and we'll provide tailored suggestions to help you find the ideal test.
  3. Once your order is placed, we’ll create your doctor’s lab order remotely, without any need for you to make a trip to a doctor in person or to talk to the doctor. Expect to receive your doctor’s lab order right in your inbox. It will also be in your patient portal if you need to find it later. We’ll also include instructions regarding fasting and other requirements for your test. Your patient portal will be auto-created hassle-free during checkout.
  4. If this is your first time ordering, you'll be prompted to create a password for instant login access to your patient portal. It's a quick way to conveniently access your orders and results whenever you want.
  5. When you’re ready, visit one of our 4,000 locations. Just bring your ID – no printing or faxing of your lab order is needed, as your order and details will already be in the lab system.
  6. Note that most lab locations don’t accept walk-ins, so it’s best to book an appointment in advance. Don’t worry – we’ll provide detailed instructions along the way.
  7. You’ll get your results via email & SMS and dive into understanding your body better. Yup, that easy!
  8. If you have any questions, please text us at 754-799-7833 or email [email protected] and we'll gladly help you.
How do I know which test to get?
In the test options, find the test you want. If you’re not sure which test to get, we can lend a hand in finding the right option.

Just text or call us at 754-799-7833, email us at [email protected], and we'll gladly help you. We've got your back and reply quickly.
Is it possible to make changes to my lab order if I made a mistake with the name, date of birth, or any other details?
Absolutely! We totally understand that errors can happen. No worries, we're here to help you.

Just reach out to us via text at 754-799-7833 or shoot us an email at [email protected]. Remember to include your order number and let us know the correct information you’d like to update. Our awesome team will jump right in and make sure everything is sorted out and accurate for you.

There are no changes necessary if your address is wrong on the requisition though. We don’t mail anything out.

Our lab requires an address to be listed to generate an order.
Do you accept health insurance?
Only HSA & FSA is accepted.

Our services are strictly self-pay and cannot be submitted to your health insurance provider except for Health Savings Accounts or Flexible Savings Accounts.

This policy applies to all insurance companies, including federal health insurance programs like Medicare.

If you have any questions, please text us at 754-799-7833 or email [email protected].
Can I cancel my order?
Yes.

We get it – sometimes your needs change.

As long as your samples haven’t been collected yet, we’re happy to help you cancel your order.

If you have any further questions, please text us at 754-799-7833 or email [email protected].

You can read more about our cancellation policy here.
How can I find a lab location near me?
During the ordering process, you’ll be able to select a specific lab near you, with no strings attached! You can switch it up later easily and visit any of our authorized locations as long as it’s the same lab company you selected your test for (Quest Diagnostics or Labcorp).

Before you proceed with your order, feel free to browse through all our lab locations here. This will give you the peace of mind of knowing that there's a lab nearby your home, office or your favorite gym.

If you have any questions, please text us at 754-799-7833 or email [email protected] and we'll gladly help you.

Here’s why 1,000,000+ customers chose us for affordable hassle-free private blood testing.

You get clinical lab reports & simplified health insights.
Save time & gas, go straight to the lab. Our doctors cover the rest.
Results start landing the next day after your lab visit.*
We don’t sell or share your data. Your time & privacy matter.
US-licensed doctors have your back if things get unclear.
No hidden fees, nice discounts for regular checkups.
Save a trip to the doctor, go directly to the lab
Instant orders, results often overnight*
Results explained in simple language
Reviewed by US licensed doctors
Fast & confidential, we never sell or share your data
No insurance needed, transparent pricing
Demo results
Carbon Dioxide 18 mmol/L
Demo results
Low Optimal 23 - 29 High
18 mmol/L

What this means

Your CO2 levels are below the optimal range, which may indicate your blood is slightly too acidic (metabolic acidosis). This can contribute to fatigue, rapid breathing, and reduced energy, and may be related to kidney function, diabetes management, or other metabolic factors.

* Regular blood test results (e.g., CBC) typically start arriving the next business day after sample collection. More complex tests, such as hormone panels, may take up to 10–15 business days due to their complexity.
Here’s how easy it is to get blood work done on your terms
Choose a checkup
Order your test Save a trip to the doctor. Your results will come with clear, friendly explanations. Takes 2 minutes
Book a lab
Book an appointment Visit any of our 4,000 nearby lab locations to have your samples collected. Book or walk-in
Choose a checkup
Get results Receive a clear, easy-to-digest health report by email & SMS within a few business days. Get answers, fast

Blood Test for Breathing Issues and Energy Imbalances

Google
3,138 reviews
  • Reveal how well your lungs are functioning
  • Clarify if your body is retaining fluids
  • Detect imbalances affecting your energy levels

1,000,000+ blood tests later, here's what our customers say

Google reviews 3138 reviews Next
Still got questions? Text our super-cool support team at 754-799-7833 to get help finding your ideal checkup.