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Chlamydia IgG Antibody, Serum (Qualitative Immunoassay)

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

This test detects antibodies to *Chlamydia trachomatis*, a common bacterial infection that can affect the reproductive system, eyes, or respiratory tract. It helps determine past exposure rather than active infection.

Quick summary

["This test checks for signs your body made to fight a past *Chlamydia* infection."]

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

Key facts at a glance

LOINC
57679-3
Short code
Chlamydia IgG sp1 Ser Ql IA
Synonyms
Chlamydia IgG sp1 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

Why This Test Is Done

Doctors may order this test if you have symptoms of past exposure to *Chlamydia*, such as unusual discharge, pain during urination, or recurrent infections. It’s also used in screening for sexually transmitted infections (STIs) in certain populations.

How the Test Works

A small blood sample is taken from your arm and sent to a lab. The lab uses an immunoassay to detect IgG antibodies specific to *Chlamydia*. These antibodies indicate your immune system has encountered the bacteria at some point, but they do not confirm an active infection.

Sample Collection

You’ll have a needle inserted into your vein to draw blood. It usually takes a few minutes. You may feel slight discomfort, but it’s quick and not painful.

What to Expect After the Test

After the blood draw, you can return to your normal activities immediately. There’s no special preparation needed, but avoid heavy exercise or strenuous activity for 24 hours if you had bruising or bleeding at the site.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Positive results suggest past exposure to *Chlamydia*, meaning your body has developed antibodies to fight it. However, this does not mean you currently have an infection. If you’re at risk for STIs or have symptoms, discuss further testing with your healthcare provider. Negative results mean no detectable antibodies were found, but they do not rule out past exposure or other infections.

Short name

Chlamydia IgG Antibody Test

Frequently asked questions

How long does it take to get results?
Results are typically available within 1 to 3 business days, depending on your lab’s processing time. Your healthcare provider will contact you once they have the results.
Can I get this test at home?
No, this test requires a blood sample collected by a healthcare professional in a clinical setting. Home collection kits are not available for this specific test.
What if my test is positive for Chlamydia IgG antibodies?
A positive result means your body has antibodies to *Chlamydia*, but it does not indicate an active infection. If you have symptoms like unusual discharge, pain, or recurrent infections, talk to your doctor about further testing (e.g., Chlamydia culture or PCR) to check for current infection. Your provider may also recommend counseling or prevention strategies if you’re at risk.
  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