Chlamydia trachomatis Antibody, Serum (Qualitative Immunoassay)
This test checks for antibodies in your blood that may indicate past or current infection with *Chlamydia trachomatis*, a common bacterial infection often spread through sexual contact.
["This screening helps identify possible infection that your doctor may need to treat."]
Key facts at a glance
- LOINC
- 100120-5
- Short code
- C trachomatis Ab Pnl Ser
- Synonyms
- C trachomatis Ab Pnl Ser
- Category
- chemistry
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- 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 sexually transmitted infections (STIs), such as having multiple sexual partners or a history of STIs.
What to Expect Before the Test
No special preparation is needed. You’ll provide a blood sample from a simple venipuncture (blood draw) at your doctor’s office or lab. Wear comfortable clothing and arrive with an empty stomach if instructed, though this test does not require fasting.
What the Test Results Mean
A positive result means your blood contains antibodies likely from a past *Chlamydia* infection. A negative result suggests no detectable antibodies, but it doesn’t guarantee you’re free of infection—other tests may be needed if symptoms persist.
How This Test Helps Your Care
If antibodies are found, your doctor may recommend further testing (like a urine or cervical swab) to confirm active infection. Early treatment with antibiotics can prevent complications like pelvic inflammatory disease or infertility.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Clinical Significance: *Chlamydia* is a silent but serious infection that can cause long-term health issues if untreated. Antibody detection helps guide treatment and prevent spread to partners or future pregnancies.
Short name
Chlamydia Antibody Screen
Frequently asked questions
What does a positive result mean?
Can I get this test at home?
How long does it take to get results?
Sources
- 1
- 2Lab Tests OnlineSource
- 3
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.
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