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Lab test

Chlamydophila pneumoniae Antibodies (IgG, IgA, IgM) Test

This test measures three antibody types, IgG, IgA, and IgM, to Chlamydophila pneumoniae in a blood serum sample. Quest describes this bacterium as associated with infantile and community-acquired pneumonia.

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About this test

The test uses an immunofluorescence assay on a 1 mL serum sample to measure IgG, IgA, and IgM antibody levels produced in response to Chlamydophila pneumoniae. Quest lists this bacterium, also referenced under the aliases C.

Because the test measures three separate antibody classes, it can offer more context than a single antibody level; a clinician reads the combined pattern alongside a person's symptoms and history. Chlamydophila pneumoniae is a respiratory bacterium, so this antibody test is a familiar part of workups that consider recent or past respiratory infection.

Test details

CollectionQuest patient service center

Quest resources

Additional details

What this test looks at

The test reports IgG, IgA, and IgM antibody levels to Chlamydophila pneumoniae, along with an interpretation, using an immunofluorescence assay on a serum sample. Reporting all three antibody classes together, rather than just one, gives a clinician a fuller picture of the antibody response than a single class alone.

This test isn't part of the Celio Health store at the moment, so it can't be ordered or requested here. The test menu lists everything that can.

Laboratory results should always be interpreted by a licensed clinician who knows your health history. This page is information about a test, not medical advice.

Frequently asked questions

What does this test measure?

It measures IgG, IgA, and IgM antibody levels to Chlamydophila pneumoniae in a serum sample, using an immunofluorescence assay.

How is the sample collected?

The test uses a 1 mL serum sample from a routine blood draw.

Do I need to prepare for this test?

No preparation instructions are listed for this test, though people follow any instructions their ordering clinician provides.

What is Chlamydophila pneumoniae?

Quest describes it as a bacterium associated with infantile and community-acquired pneumonia, also listed under names such as C. pneumoniae Ab and Chlamydophila Ab.

Last updated 2026-09-18 · How we write about lab testing

Educational content

This page is for general educational purposes only. It is not medical advice, and it is not a substitute for consultation with a qualified healthcare professional. Laboratory results should always be interpreted by a licensed clinician who knows your health history. If you have questions about your health or your results, talk with your doctor. If you think you may be experiencing a medical emergency, call 911.