Test Overview
Test Methodology

Transcription mediated amplification (TMA).

Test Usage

Detection of Chlamydia trachomatis and Neisseria gonorrhoeae in male or female rectal specimens.

Reference Range *


* Reference ranges may change over time. Please refer to the original patient report when evaluating results.

Test Limitations

Adequate specimen collection is important. Mucoid specimens may cause inhibition of the assay. Some feminine sprays, powders, spermicidal agents, and lubricants may interfere with the assay and should not be used prior to specimen collection. A negative result does not exclude the possibility of infection. Predictive value of test will vary depending on disease prevalence. Nucleic acids may persist for up to 4 weeks following appropriate antimicrobial therapy.

Test Details
Days Set Up
Monday - Friday
Analytic Time

Monday - Friday TAT 1 day
Specimens received on Friday afternoon, Saturday or Sunday TAT 2-3 days

Soft Order Code
MiChart Code
Chlamydia Trachomatis/Neisseria Gonorrhoeae rectal
  • CT RNA Amplification
  • Chlamydia trachomatis RNA Amplification
  • CHLR
  • GCR
  • Neisseria gonorrhoeae RNA Amplification
  • GC RNA Amplification
Specimen Requirements

Use the APTIMA Unisex Swab Collection Kit. 1. Insert the small, blue shaft collection swab (NOT the larger white shaft cleaning swab) approximately 3-5 cm into the rectum. Rotate swab against the rectal wall at least 3 times. 2. Withdraw the swab carefully. Swabs that are grossly contaminated with feces should be discarded and the collection repeated. 3. Remove the cap from the swab specimen transport tube and immediately place the swab into the transport tube. 4. Carefully break the swab shaft at the score line. 5. Re-cap the swab specimen transport tube tightly and label with two identifiers. Store and transport at room temperature or refrigerated (up to 30 days).

This assay should not be used for the evaluation of suspected sexual abuse or other medico-legal investigations where chain of custody is required. MLabs does not offer chain of custody testing.
Normal Volume
1 swab
Minimum Volume
1 swab
Rejection Criteria
The following specimens are unacceptable: white shaft cleaning swabs, wooden swabs, or Calgiswabs, BD Eswabs, BD ProbeTec transport, M4-RT transport.
Additional Information

A combined assay for simultaneous detection of Chlamydia trachomatis (CT) and Neisseria gonorrhoeae (NG) is used. Individual CT and NG test options are not available. If either CT or NG is requested, both assays will be performed, reported, and billed.

CPT Code
87491, 87591
Fee Code
32301, 32302