Chlamydia trachomatis (CT) and Neisseria gonorrhoeae (GC) by molecular amplification - urethral specimen
- LIS Mnemonic: CTGCMA
Collect
MALE URETHRAL SWAB SPECIMEN - Obtain an APTIMA Combo 2 Assay Unisex Swab Specimen Collection Kit for Endocervical and Urethral Swab Specimens to collect patient specimens. Patients should not have urinated for at least one hour prior to sample collection. If they have already urinated, please have them wait 1 hour before collecting the specimen. Insert the specimen collection swab (blue shaft) 2-4 cm into the urethra. Gently rotate the swab clockwise for 2-3 seconds in the urethra to ensure adequate sampling. Withdraw the swab carefully. Remove the cap from the swab specimen transport tube and immediately place the specimen collection swab into the transport tube. Carefully break the swab shaft at the scoreline. Be extremely careful to avoid splashing of the tube contents. Tightly recap the swab specimen transport tube.
Volume Required
NA
Minimum Required
NA
Transport
After specimen collection, transport the collection tube at room temperature.
Stability
Stable
Processing
Use only the swabs and the specimen transport tubes contained in the APTIMA Combo 2 Assay Unisex Swab Specimen Collection Kit for Endocervical and Urethral Swab Specimens to collect patient specimens. Collection kits are available from Central Laboratory Services or the Clinical Virology Laboratory. Please carefully follow the instructions on the cover of the collection kit to obtain the desired specimen. For swab specimens, use only the unisex BLUE SHAFTED swab for specimen collection. The large tipped cleaning swab (WHITE SHAFT) should only be used to remove excess mucous from the cervical os and surrounding mucosa and should be discarded after use. Specimens not collected as instructed will be rejected.
Unacceptable conditions
Specimen not collected using an appropriate GenProbe APTIMA Combo 2 collection kit. Specimens not collected according to the defined collection instructions.
Days Performed
Mon, Wed, Fri
Reported
Daily
Reflex Testing
Test for Neisseria gonorrhoeae is performed in combination with the test for C. trachomatis. Positive results obtained for either C. trachomatis or N. gonorrhoeae when using the GenProbe APTIMA Combo 2 Assay will be confirmed using a second supplemental molecular amplification assay that detects a nucleic acid sequence different from that detected in the initial screening assay.
CPT
87801 (Combo) 87491 (CT supplemental) 87591 (GC supplemental)
Methodology
The GenProbe APTIMA Combo 2 Assay uses transcription-mediated amplification (TMA) to replicate a specific region of the 23S rRNA from C. trachomatis and a specific region of the 16S rRNA from N. gonorrhoeae via DNA intermediates. A unique set of primers is used for each target molecule.
Disease Information
Utility:
The GenProbe APTIMA Combo 2 Assay is designed to detect the presence of C. trachomatis and N. gonorrhoeae in clinician-collected endocervical, vaginal, and male urethral swab specimens, patient-collected vaginal swab specimens, and in female and male urine specimens. The assay is also intended for use with testing of gynecological specimens collected in the PreserCyt Solution and processed with the Cytyc ThinPrep 2000 System. The assay may be used to test specimens from symptomatic and asymptomatic individuals to aid in the diagnosis of gonococcal and/or chlamydial urogenital specimens. Alternative specimen sources such as conjunctival, nasopharyngeal and rectal specimens can also be tested using this assay for newborns or infants with suspected conjunctivitis and/or pneumonia due to infection with C. trachomatis during birth and for anorectal infections in women and men. Lastly, the test is applicable for the detection of C. trachomatis and/or N. gonorrhoeae in investigating sexual assault and abuse. Additional testing will be done to confirm any initial positive NAAT results in this patient population.
Interpretation
If positive, results are reported as Chlamydia trachomatis rRNA detected or Neisseria gonorrhoeae rRNA detected or both Chlamydia trachomatis rRNA and Neisseria gonorrhoeae rRNA detected.
Reference Values
Negative or no Chlamydia trachomatis rRNA detected.
Negative or no Neisseria gonorrhoeae rRNA detected.
Contact Us
- 215-590-2050
- Fax: 215-590-2556
- Contact Us Online