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Chlamydia Antibody Test by Immunoassay (Serum/Plasma)

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

This test detects antibodies to *Chlamydia trachomatis*, a common bacterial infection that can affect the genitals, throat, or eyes. Antibodies develop after infection, helping your immune system fight the bacteria.

Quick summary

["This test helps identify past or current infections that may require treatment or further evaluation."]

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

Key facts at a glance

LOINC
32003-6
Short code
Chlamydia Ag Prt Ql IA
Synonyms
Chlamydia Ag Prt 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 unexplained pelvic pain. It’s also part of routine screening for sexually active individuals, pregnant women, or those with multiple sexual partners. In some cases, it’s used to confirm a diagnosis after other tests (like a swab) suggest chlamydia.

What to Expect Before the Test

No special preparation is needed. You’ll provide a blood sample (usually from your arm) in a clinic or lab. If you’re pregnant, your healthcare provider may recommend testing during your first prenatal visit or if you have symptoms.

What the Test Results Mean

A positive result means your body has produced antibodies against chlamydia, suggesting past or current infection. A negative result means no detectable antibodies were found at this time. Results don’t always show recent infections immediately, so retesting may be needed if symptoms persist.

Possible Side Effects or Risks

Minor side effects from blood drawing (like bruising or slight pain) are rare but possible. There are no major risks associated with this test.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Chlamydia Antibody Screening

Frequently asked questions

How long does it take to get results?
Results are typically available within 1–3 business days, depending on your lab’s processing time. Your healthcare provider will discuss the results with you during your next visit.
Can I get treated before knowing my results?
If you have symptoms of chlamydia and test positive, treatment is urgent. Antibiotics can clear the infection quickly, but you may need to avoid sexual contact until treated. If you’re unsure about your results, follow up with your doctor to discuss next steps.
Is this test covered by insurance?
Most insurance plans cover this test as part of routine STI screening or if symptoms are present. Check with your insurance provider to confirm coverage details before your appointment.
  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