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Test Code LAB4887 N. gonorrhoeae / C. trachomatis Amplification

Performing Laboratory

Barnes-Jewish Hospital Molecular Infectious Disease Laboratory

Methodology

Nucleic Acid Amplification Test (NAAT) for the detection of Chlamydia trachomatis and Neisseria gonorrhoeae (CT/NG) using the following platforms:

  • Inpatient/ED: Cepheid Xpert® CT/NG Assay performed on the GeneXpert System
  • Outpatient and ThinPrep (endocervical) samples: Roche cobas® CT/NG Assay performed on the cobas 6800 System

Specimen Requirements

Call Barnes Jewish Hospital Laboratory Customer Service at 314-362-1470 to obtain the appropriate Urine Specimen Collection Kit (urine specimens) or Swab Specimen Collection Kit (endocervical, vaginal, rectal, and pharyngeal specimens).

 

CT/NG testing can also be performed on endocervical samples collected in ThinPrep PreservCyt solution for PAP and/or HPV testing.

 

Acceptable Specimens:

Inpatient and ED:

Urine: Collected in Xpert Urine Specimen Collection Kit

Endocervical, Vaginal, Rectal, and Pharyngeal Swabs: Collected in Xpert Swab Specimen Collection Kit

Click here for Xpert specific urine and swab collection kit instructions.

 

Outpatient:

Urine: Collected in cobas PCR Urine Sample Kit

Endocervical, Vaginal, Rectal, and Pharyngeal Swabs: Collected in cobas PCR Media Dual Swab Sample Kit

Click here for cobas specific urine and swab collection kit instructions.

 

Endocervical ThinPrep:

Collected in ThinPrep PreserveCyt solution

 

Ocular Swabs:

Performed at Mayo Laboratory, must be collected using the Aptima Unisex Swab Collection Kit. Please call BJH Customer Service at 314-362-1470 to obtain these collection kits.  See https://www.mayomedicallaboratories.com/test-catalog, and search for 43721 for specimen collection requirements.

 

 

Unacceptable Specimens:

Specimens (other than ocular swab) received in APTIMA collection tubes

Day(s) Test Set Up

Monday through Sunday

Turnaround Time:
Cepheid Xpert Assay: Within 8 hours from receipt to the laboratory

Roche cobas Assay: Within 24 hours from receipt to the laboratory

Test Classification and CPT Coding

87491
87591

Reference Values

Chlamydia trachomatis - Not Detected

 Neisseria gonorrhoeae - Not Detected

Specimen Transport Temperature

Swabs - Ambient/Refrigerate OK

Urine - Refrigerate/Ambient OK

ThinPrep PreservCyt solution - Ambient OK

Additional Information

For BJH Laboratory Use Only

Minimum Volume:

Endocervical, Vaginal, Rectal, and Pharyngeal: 1 Swab Specimen Collection Kit

  

Urine:  to fill line of Urine Collection Kit
Laboratory Processing Instructions:
Test performed in BJH Molecular Infectious Disease for endocervical (swab), endocervical (ThinPrep), vaginal, rectal, pharyngeal, and urine specimens.

Test performed at Mayo Medical Laboratory for ocular specimens.