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Chlamydia trachomatis IgG Antibody, Genital Specimen (Serum/Plasma)

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

This test detects antibodies to *Chlamydia trachomatis*, a bacterium that can cause genital infections, pelvic inflammatory disease, and complications in pregnancy. It helps identify past exposure rather than active infection.

Quick summary

["This test checks for immunity or past infection from *Chlamydia*, not current illness."]

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

Key facts at a glance

LOINC
31779-2
Short code
C psittaci Ag Genital Ql
Synonyms
C psittaci Ag Genital Ql
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
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 Might Be Ordered

Your healthcare provider may recommend this test if you have symptoms like abnormal vaginal discharge, pain during urination, or if you’ve been exposed to *Chlamydia*. It’s also used in screening for sexually transmitted infections (STIs) or during pregnancy to assess risk.

What to Expect Before the Test

No special preparation is needed. A blood sample (serum or plasma) is drawn from a vein, usually in your arm. The test is typically done in a lab and results may take several days to weeks.

What the Test Results Mean

Positive results indicate the presence of *Chlamydia trachomatis* antibodies, suggesting past infection. Negative results mean no detectable antibodies, but they don’t rule out current infection—other tests may be needed for active disease.

Common Causes of Positive Results

A positive result could mean you had *Chlamydia* in the past, possibly from sexual contact. It doesn’t confirm active infection today, so follow-up testing may be needed if symptoms persist.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

Chlamydia IgG Antibody

Frequently asked questions

How long do I need to wait for results?
Results may take 3 to 14 days, depending on the lab. Your provider will contact you once they’re ready.
Can I still have an active infection if this test is positive?
No. This test only detects antibodies from past infection. For active *Chlamydia*, a different test (like nucleic acid amplification) would be needed.
What if I’m pregnant and this test is positive?
If positive, your provider may recommend further testing or treatment to prevent complications for you and your baby. Always discuss results with your healthcare team.
  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