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Chlamydia Antibody Test (Serum or Plasma) – Qualitative Immunoassay

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

This test detects antibodies in your blood that may indicate past or current infection with *Chlamydia trachomatis*, a common sexually transmitted bacterium.

Quick summary

["Helps identify possible infection that may require treatment or further testing."]

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

Key facts at a glance

LOINC
45115-3
Short code
Chlamydia Ag Urth Ql IF
Synonyms
Chlamydia Ag Urth Ql IF
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
if
CPT
87110
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

Your healthcare provider may recommend this test if you have symptoms like unusual discharge, pain during urination, or if you’ve been exposed to *Chlamydia*. It’s also used as a routine screening for sexually active individuals at higher risk.

What to Expect Before the Test

No special preparation is needed. You’ll provide a blood sample (usually from your arm) or, in some cases, urine. Results are qualitative (positive/negative) and not used to diagnose active infection alone.

How the Test Works

The test uses an immunoassay to detect antibodies (IgG or IgM) produced by your immune system in response to *Chlamydia*. Positive results suggest exposure but do not confirm active infection without additional testing.

What the Results Mean

A positive result means antibodies were found, indicating past exposure or infection. A negative result means no detectable antibodies were found at the time of testing. Always consult your provider for interpretation.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Untreated *Chlamydia* can lead to complications like pelvic inflammatory disease, infertility, or chronic pelvic pain. Early detection and treatment with antibiotics can prevent these issues. This test is not for active infection diagnosis but for screening.

Short name

Chlamydia Antibody Screen

Frequently asked questions

What does a positive result mean?
A positive result means your body produced antibodies to *Chlamydia* at the time of testing, which could indicate past infection or exposure. It does not confirm active infection without further testing.
Can I get treated if my test is positive?
Only a healthcare provider can confirm active infection (often with a separate test like PCR) and prescribe treatment. Antibiotics are the standard treatment for *Chlamydia* if confirmed.
How soon after exposure can I get tested?
Antibodies may take weeks to develop after exposure, so testing too soon may yield negative results. Some providers recommend retesting after 4–6 weeks if symptoms persist.
  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