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Chlamydia trachomatis Antibody Panel, Serum, 20-Test Set

Published: August 9, 2026Updated: August 16, 2026

This panel measures antibodies against Chlamydia trachomatis in a blood (serum) sample. It is used mainly to help assess exposure to the bacteria, not to diagnose an active, uncomplicated genital infection directly.

Quick summary

["A Chlamydia antibody panel shows whether your immune system has made antibodies to Chlamydia, which can indicate past or current exposure, but results must be interpreted with your symptoms and other tests."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
86659-0
Short code
CHLMFP
Synonyms
—
Category
chemistry
Sample
serum
Container
Serum separator tube (SST) or red-top tube
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
Fluorescence Polarization Assay (FPAR 2.0)
CPT
86632
SNOMED
10828004
Specimen volume
1.0 mL serum
Stability
Room temperature: 8 hours; Refrigerated (2-8°C): 7 days; Frozen (-20°C or below): 30 days
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
24–72 hours
Order
routine

What This Test Measures

The test looks for antibodies, which are proteins your immune system produces when it encounters an infection. For Chlamydia, these antibodies can appear after an infection and may stay in the blood for months or years afterward. The "20-set" part of the name refers to a test set configuration rather than a specific number of analytes you need to track.

How the Sample Is Collected

A healthcare professional collects a blood sample, usually from a vein in your arm. The sample is separated so the serum portion can be tested. This is different from the more common swab or urine nucleic acid tests used to detect an active genital Chlamydia infection.

What Results Can and Cannot Tell You

Antibody testing can suggest whether you have been exposed to Chlamydia at some point. However, it generally cannot tell you whether the infection is current, past, or cured, and it is not the preferred test for routine screening of uncomplicated genital infections. A positive result does not by itself prove an active infection, and a negative result does not always rule out exposure.

Why Your Clinician May Order It

Clinicians may order Chlamydia antibody testing in specific situations, such as evaluating certain complications or unusual presentations. It is not a substitute for direct detection tests like nucleic acid amplification testing (NAAT) when an active infection is suspected. Your clinician will choose the right test based on your history and symptoms.

Reference range

Negative: No antibodies detected. Positive: Antibodies to Chlamydia species detected.N/A

Specimen: serum

No special patient preparation required. Specimen may be collected at any time of day.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Chlamydia trachomatis is a common sexually transmitted bacterium that can cause genital infections and, if untreated, complications such as pelvic inflammatory disease or infertility in some people. Antibody tests reflect the immune response to prior or ongoing exposure but have limited ability to confirm active infection. Direct detection methods such as NAAT remain the standard for diagnosing active genital Chlamydia, and antibody results should always be interpreted alongside clinical findings and other laboratory tests.

Short name

Chlamydia Antibody Panel

Frequently asked questions

Does a positive Chlamydia antibody test mean I currently have an infection?
Not necessarily. A positive antibody result can reflect a past infection that has already cleared or been treated, because antibodies may persist for a long time. Your clinician will use your symptoms, history, and direct tests such as NAAT to determine whether you have an active infection.
Is this the same as the routine Chlamydia test I get at a clinic?
No. Routine testing for active genital Chlamydia usually uses a swab or urine sample with nucleic acid amplification testing. This blood antibody panel is a different type of test and is not typically used for routine screening.
What should I do if my result is positive or negative?
Discuss the result with your clinician rather than interpreting it alone. They can explain what it means in your situation, recommend additional or direct testing if needed, and advise on treatment or follow-up. Do not start or stop any treatment based on this test result without medical guidance.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy