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Chlamydia IgG Antibody (Serum) – Qualitative

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

This test detects antibodies to the Chlamydia bacterium in your blood, helping identify past or ongoing infection.

Quick summary

["This test checks for immunity or past exposure to chlamydia."]

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

Key facts at a glance

LOINC
57680-1
Short code
Chlamydia IgG sp2 Ser Ql IA
Synonyms
Chlamydia IgG sp2 Ser Ql IA
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
ia
CPT
82784
Specimen volume
5 mL
Stability
Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–24 hours
Order
routine

What Does This Test Measure?

The test measures IgG antibodies, a type of immune protein your body produces in response to Chlamydia infection. These antibodies indicate whether your immune system has encountered the bacterium at some point, even if the infection has cleared. This is not a test for active infection but rather a marker of exposure.

Why Might You Need This Test?

Doctors may order this test if you have symptoms or risk factors for chlamydia (like unprotected sex) or if you’ve been exposed. It’s also used to assess immunity after vaccination or treatment.

What Does a Positive Result Mean?

A positive result suggests your body has produced antibodies against Chlamydia, meaning you likely had exposure in the past. However, this does not confirm an active infection today.

What Does a Negative Result Mean?

A negative result means no detectable IgG antibodies were found, indicating either no prior exposure or a very recent infection that hasn’t yet triggered antibody production.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

IgG Chlamydia Antibody (Serum)

Frequently asked questions

Can this test detect a current chlamydia infection?
No, this test only detects IgG antibodies, which indicate past exposure. For active infection, a separate test (like PCR) is required.
What does it mean if I have a positive IgG result?
A positive result means your body has likely encountered Chlamydia at some point, but it doesn’t confirm whether the infection was active or resolved. If you’re concerned about current infection, discuss symptoms and risk factors with your healthcare provider.
Is this test the same as a chlamydia culture?
No, this is an antibody test (serology), while a culture would directly identify live Chlamydia bacteria in a sample like urine or cervical swab.
  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