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Chlamydia IgA Antibody (Serum) – Confirmatory Test

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

This test detects antibodies to *Chlamydia trachomatis* in your blood, helping confirm past or ongoing infection by this sexually transmitted bacterium.

Quick summary

["This test helps diagnose chlamydia infection by checking for IgA antibodies, which may indicate an active or resolved infection."]

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

Key facts at a glance

LOINC
29677-2
Short code
Chlamydia IgA Ser Ql
Synonyms
Chlamydia IgA Ser Ql
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
CPT
82784
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 order this test if you have symptoms of chlamydia (e.g., unusual discharge, pain during urination) or if you’ve been exposed to the infection. It’s also used in screening for sexually transmitted infections (STIs).

What to Expect Before the Test

No special preparation is needed. You’ll provide a blood sample, typically drawn from your arm in a clinic or lab setting. The sample is processed to detect IgA antibodies against chlamydia.

How the Test Works

The test uses an immunoassay method to identify IgA antibodies specific to *Chlamydia trachomatis*. These antibodies are part of your immune response to the infection. A positive result suggests past or current infection, but additional testing may be needed for confirmation.

Interpreting Your Results

Results are qualitative (positive or negative) and do not provide a timeline for infection. A positive result indicates the presence of IgA antibodies but does not specify whether the infection is active or resolved. Follow-up testing (e.g., nucleic acid amplification) may be recommended for diagnosis.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Chlamydia IgA Antibody (Confirm)

Frequently asked questions

Will this test show if I have an active chlamydia infection?
This test detects IgA antibodies, which can indicate past or ongoing infection. However, it may not always distinguish between active or resolved infection. A positive result should be confirmed with additional testing (e.g., nucleic acid amplification) for diagnosis.
Can I take antibiotics before this test?
Yes, you can take antibiotics if prescribed by your healthcare provider. However, if you’re unsure, inform your provider before the test, as antibiotics may affect antibody levels and result interpretation.
How long does it take to get results?
Results are typically available within 1–3 business days, depending on lab processing times. Your provider will discuss the results with you during your follow-up visit.
  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