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Chlamydia Antibody Test (Serum or Plasma) – Immunoassay

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

This test detects antibodies in your blood that your immune system produces in response to the Chlamydia bacterium, often linked to sexually transmitted infections.

Quick summary

["Helps diagnose past or current Chlamydia infections by identifying your immune system’s reaction to the bacteria."]

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

Key facts at a glance

LOINC
45113-8
Short code
Chlamydia Ag Urth Ql IA
Synonyms
Chlamydia Ag Urth 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
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

Doctors may order this test if you have symptoms like unusual discharge, pain during urination, or if you’ve been exposed to Chlamydia. It can also be part of routine screening for sexually transmitted infections (STIs).

What to Expect Before the Test

No special preparation is needed. You’ll provide a blood sample, usually from a vein in your arm, or sometimes urine if a urine-based test is used.

What the Test Results Mean

Positive results indicate your body has produced antibodies against Chlamydia, suggesting past or current infection. Negative results mean no detectable antibodies were found at this time.

Possible Side Effects

You may experience mild bruising, soreness, or swelling at the injection site. Rarely, there could be a slight fever or headache.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

This test is critical for diagnosing Chlamydia, a common bacterial STI that can cause serious health issues if untreated, including pelvic inflammatory disease or long-term reproductive complications. Early detection and treatment improve outcomes.

Short name

Chlamydia Antibody (IgG/IgM)

Frequently asked questions

How long does it take to get results from this test?
Results are typically available within 1 to 3 business days, depending on your lab’s processing time. Follow-up with your healthcare provider if you have concerns about your results.
Can I still have Chlamydia if my antibody test is negative?
Yes, a negative antibody test does not rule out a current infection. Chlamydia may not always trigger an immune response detectable by antibody tests, especially if the infection is very recent or treated early. Additional testing (like PCR) may be needed for confirmation.
What should I do if I test positive for Chlamydia antibodies?
If positive, consult your healthcare provider for further evaluation, including retesting with a more specific method (like PCR) to confirm active infection. Treatment options are available to clear the infection and prevent complications. Always inform sexual partners for appropriate testing and treatment.
  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