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Chlamydia trachomatis Genital Infection Antibody Screening (Serum/Plasma)

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

This test checks for antibodies to *Chlamydia trachomatis*, a bacteria that can cause genital infections. Antibodies indicate past or current exposure, though they don’t confirm active infection.

Quick summary

["This screening helps identify possible past exposure to a sexually transmitted infection (STI)."]

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

Key facts at a glance

LOINC
91860-7
Short code
C trach Ag Genital Ql IF
Synonyms
C trach Ag Genital 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
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’ve been sexually active with multiple partners. It’s also part of routine STI screening for certain groups, such as pregnant individuals or those with risk factors for infection.

What to Expect During Testing

A blood sample is taken from a vein in your arm. You may feel a slight pinch, but the procedure is quick. No special preparation is needed, though fasting isn’t required for this test.

What the Results Mean

Positive results suggest you may have had exposure to *Chlamydia trachomatis* at some point. Negative results mean no detectable antibodies were found in this sample, but they don’t guarantee you’re free of infection. Follow-up testing or treatment may still be needed if you have symptoms or risk factors.

What to Do Next

If your results are positive, your provider will likely recommend further testing (such as a urine or genital swab) to check for active infection. Treatment with antibiotics is usually prescribed if an infection is confirmed. Always inform your partner(s) of your results to prevent spreading the infection.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Chlamydia Antibody Screen

Frequently asked questions

How long does it take to get results?
Results are typically available within 3–7 business days, depending on your lab’s processing schedule.
Can I get treated without knowing if I have an active infection?
No. Antibody tests alone don’t diagnose active infection. If you have symptoms or risk factors, further testing (like a urine or swab) is needed before treatment can be started.
Does this test cover other STIs?
No. This test specifically looks for antibodies to *Chlamydia trachomatis*. Other STIs (like gonorrhea or HIV) would require separate tests.
  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