Lab test
Carbon Monoxide, Blood Test
A carbon monoxide blood test measures carboxyhemoglobin, the form of hemoglobin bound to carbon monoxide.
- Typical price
- From $179
- Results
- 1-3 business days
- Preparation
- See preparation notes below
- Sample
- Blood draw or sample collection at a local center
About this test
A carbon monoxide blood test measures carboxyhemoglobin, the form of hemoglobin bound to carbon monoxide. Carbon monoxide is an odorless gas produced by combustion, such as from vehicle exhaust, furnaces, generators, and smoke, and it can also come from smoking. Because it binds hemoglobin far more strongly than oxygen, high levels reduce oxygen delivery to tissues. Testing is used to evaluate suspected exposure, smoke inhalation, and unexplained headache, dizziness, or nausea that may relate to indoor air.
What this test measures
- Carboxyhemoglobin (COHb) The percentage of hemoglobin bound to carbon monoxide, used to estimate the severity of exposure.
- Total Hemoglobin Hemoglobin concentration is often reported alongside COHb so oxygen-carrying capacity can be assessed.
Who this test may be right for
- People with suspected carbon monoxide exposure at home or work
- Individuals evaluated after smoke inhalation
- Patients with unexplained headache, dizziness, or nausea in an enclosed space
- People whose provider is assessing the effects of smoking on oxygen transport
Before your visit
- Avoid smoking before collection, as it raises carboxyhemoglobin
- Tell the phlebotomist about any recent fire, generator, or exhaust exposure
- Collect promptly after suspected exposure when advised
- No fasting is usually required
Understanding your results
An elevated carboxyhemoglobin level indicates carbon monoxide is bound to hemoglobin and can reduce oxygen delivery. Higher levels generally suggest greater exposure, and smoking also raises levels. Symptoms do not always match the number, so treatment decisions are based on the level, symptoms, and exposure source. Discuss your result and any needed follow-up with a healthcare provider.
Order this test online
- Buy online in a few minutes - no doctor's visit needed for most tests.
- Sample collection at a patient service center near you.
- Results are typically ready within 1-3 business days.
- Secure, lab-reviewed results delivered to your account.
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Questions people ask
What is carboxyhemoglobin?
Carboxyhemoglobin is hemoglobin that has bound carbon monoxide instead of oxygen. Measuring it shows how much of your hemoglobin is affected by carbon monoxide.
Does smoking affect a carbon monoxide blood test?
Yes. Smoking raises carboxyhemoglobin levels. Tell your provider about smoking so the result can be interpreted correctly.
What are common sources of carbon monoxide?
Faulty furnaces, vehicle exhaust, portable generators, and smoke are common sources. Exposure can also occur in workplaces, so report any potential source to your provider.
Do I need to fast for this test?
Fasting is usually not required for carbon monoxide testing. The more important preparation is avoiding smoking and reporting exposure.
What does the Carbon Monoxide, Blood Test measure?
Order Carbon Monoxide, Blood Test.com online through our partner and visit a local lab near you.
Do I need to fast before this test?
Follow the lab's instructions.
How long do results take?
Most Carbon Monoxide, Blood Test results are released in 1-3 business days. Specialty testing can take longer.
Is this test right for me?
This page is educational and not medical advice. Talk to a licensed healthcare provider about which tests fit your situation.
LabBookings is an independent directory. We compare test details and pricing information, but we are not a laboratory and we do not perform testing or provide medical advice. Always talk to a licensed healthcare provider about your results and treatment.
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