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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 identify past exposure, not active infection.

Quick summary

["This test checks for past exposure to chlamydia, not whether you currently have an infection."]

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

Key facts at a glance

LOINC
22184-6
Short code
Chlamydia IgG Titr Ser
Synonyms
Chlamydia IgG Titr Ser
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Ref low
8
Ref high
61
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
CPT
82977
SNOMED
3110003
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 unusual discharge, pain during urination, or if you’re at higher risk for chlamydia (e.g., sexually active individuals, those with multiple partners, or those with other sexually transmitted infections). It’s also sometimes used as part of routine screening for sexually transmitted infections.

What to Expect Before the Test

No special preparation is needed. You’ll provide a blood sample from a vein in your arm. The test is quick and typically done in a lab setting. If you’re pregnant, let your provider know before testing.

What the Results Mean

A positive result means your body has produced antibodies against chlamydia, suggesting past exposure. A negative result means no detectable antibodies were found at this time. Antibodies don’t always appear immediately after exposure, so results may take time to develop.

When You Might Need Follow-Up

If your test is positive, your provider will likely recommend further testing to check for active infection (e.g., a culture or PCR test) and may prescribe treatment. If you’re negative but have symptoms, other causes may be investigated.

Reference range

Adult males: 8-61 U/L; Adult females: 5-36 U/LN/A

Specimen: serum

No special preparation required. Avoid fatty meals before the test if possible.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

IgG Antibody to Chlamydia (Screen)

Frequently asked questions

Why is this test important?
While this test confirms past exposure to chlamydia, it doesn’t diagnose an active infection. Active chlamydia requires treatment with antibiotics. Detecting past exposure helps guide prevention strategies, such as discussing safer sex practices or vaccinations for others in your household.
What does a positive result mean for my health?
A positive IgG result alone doesn’t indicate current illness. If you’re concerned about symptoms, discuss them with your provider. They may order additional tests to check for active infection or other related conditions.
Can I get this test if I’m pregnant?
Yes, this test is safe to use during pregnancy. However, if you’re pregnant and have symptoms of chlamydia, your provider may recommend more immediate testing (like PCR) to ensure proper care for both you and your baby.
  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