Test library
Chlamydia Serology Test
A chlamydia blood test detects antibodies against Chlamydia trachomatis. It is used in some settings to assess possible non-genital chlamydia infection, and results are interpreted alongside symptoms and other testing.
Order Chlamydia Blood Test: Fast & Confidential
Order online and visit a local collection site, or choose an at-home kit where available. No referral and no insurance required.
Order Chlamydia Blood Test: Fast & Confidential- Typical turnaround
- 1-3 business days
- Starting price
- From $178
- Results
- Confidential, online
Quick answer
The chlamydia blood test looks for antibodies against Chlamydia trachomatis, the bacterium that causes chlamydia. It is used in certain situations to assess a suspected non-genital infection, such as when direct sampling is not practical. A qualified healthcare provider interprets the result, since antibody testing has limits and does not replace the nucleic acid tests used for genital screening.
What this test measures
Chlamydia is a common bacterial sexually transmitted infection caused by Chlamydia trachomatis. Standard screening for genital infection uses nucleic acid amplification on a urine or swab sample. A blood test instead looks for antibodies, which are proteins the immune system makes after encountering the bacterium. This approach can be used when clinicians want to assess a possible infection at a site that is harder to sample directly.
The test measures antibody levels in serum, often reporting IgG and sometimes IgA or IgM. Antibody tests can show that the immune system has responded to chlamydia at some point, but they do not reliably distinguish a current infection from a past one, and they are not the preferred method for routine genital screening. The sample is a standard blood draw.
Because of these limits, results are interpreted carefully. A positive antibody result suggests exposure or infection at some point, while a negative result does not rule out an infection, especially a recent one. A qualified healthcare provider decides whether additional or more specific testing, such as nucleic acid testing, is needed.
- Chlamydia trachomatis IgG antibodies
- Chlamydia trachomatis IgA antibodies
- Chlamydia trachomatis IgM antibodies
- Chlamydia trachomatis antibody titer
- Total serum immunoglobulins when included
- Chlamydia trachomatis nucleic acid amplification when paired
Why people order this test
- Support evaluation of a suspected non-genital chlamydia infection
- Assess possible exposure when direct sampling is not practical
- Follow up on symptoms that suggest chlamydia
- Provide additional context after a positive nucleic acid test
- Check antibody status when a healthcare provider requests it
- Evaluate a persistent or complicated presentation
How to prepare
No fasting is required for this blood test. A blood sample is drawn from a vein, usually at the arm. Follow any instructions from the laboratory and tell the ordering provider about recent antibiotic use or past testing.
Understanding your results
Results are usually available within one to three business days. The report shows antibody levels for Chlamydia trachomatis. Because antibodies can persist after an infection clears, a positive result does not by itself confirm an active infection, and a qualified healthcare provider interprets it in context.
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Frequently Asked Questions
How does a chlamydia blood test work?
It measures antibodies the immune system makes against Chlamydia trachomatis. Antibodies can indicate that the body has encountered the bacterium, but they do not reliably show whether an infection is current.
Is a blood test the best way to check for chlamydia?
For routine genital screening, nucleic acid testing on a urine or swab sample is preferred. Blood antibody testing is used in some specific situations and has limitations.
Can a positive result mean a past infection only?
Yes. Antibodies can remain detectable after an infection has cleared, so a positive result may reflect a past rather than a current infection. A provider can advise on further testing.
Do I need to fast?
No. Fasting is not required for this test unless it is combined with another panel that calls for it.
What should I do if the result is positive?
Discuss the result with a qualified healthcare provider, who can decide whether additional testing or evaluation is appropriate.
Ready to get tested?
Order online and visit a collection site near you, or choose a mail-in kit. No referral and no insurance required.
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Every page on this site is reviewed for clarity, sourcing, and accuracy. We update our library as testing options, collection networks, and accreditation standards change.