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Chlamydia trachomatis and Trichomonas vaginalis Test

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

A combined test for Chlamydia trachomatis (CT) and Trichomonas vaginalis, two organisms that can cause sexually transmitted infections.

Quick summary

["A positive result means that Chlamydia trachomatis, Trichomonas vaginalis, or both were detected."]

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

Key facts at a glance

LOINC
87841-3
Short code
CTA CA+TA W contr IV
Synonyms
CTA CA+TA W contr IV
Category
liver
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
ct-angio
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

What is this test?

This laboratory test checks a patient sample for Chlamydia trachomatis (CT) and Trichomonas vaginalis. CT is a bacterium, while Trichomonas vaginalis is a parasite; both can infect the genital or urinary tract.

Why might I need this test?

A clinician may order this test when symptoms suggest a sexually transmitted infection, after a partner has been diagnosed, or as part of routine screening. Testing can help identify an infection so appropriate treatment can be provided.

How is the test performed?

A urine sample or genital swab is collected and examined for the organisms, often using a nucleic acid amplification test (NAAT). The laboratory reports whether each organism was detected and may provide a measured concentration when appropriate.

How do I prepare for the test?

Fasting is usually not required. Follow the laboratory's collection instructions carefully, including any instructions about when to urinate or how to collect a first-catch urine sample.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

A positive Chlamydia trachomatis result indicates that the bacterium was detected and may require treatment and partner evaluation. A positive Trichomonas vaginalis result indicates infection with the parasite and generally also requires treatment. A negative result does not completely exclude infection if exposure was recent or symptoms persist.

Short name

CT/Trichomonas Test

Frequently asked questions

What does a positive CT/Trichomonas test mean?
It means that Chlamydia trachomatis, Trichomonas vaginalis, or both were detected in the sample. A clinician should review the result and discuss treatment.
Can I have either infection without symptoms?
Yes. Chlamydia trachomatis and Trichomonas vaginalis infections may cause few or no noticeable symptoms, which is why laboratory screening can be useful.
Does a negative result rule out infection?
Not always. Testing can miss infection, particularly if the sample was collected too soon after exposure or if symptoms continue despite a negative result.
  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