Skip to Content

Department of Health Services

Public Health Regional Laboratory

Chlamydia trachomatis and Neisseria gonorrhoeae


C. trachomatis and N. gonorrhoeae can be ordered individually or together. Only one specimen is needed if both tests are requested.

Extra-genital (throat and rectal) testing available.


Nucleic Acid Amplification Test (NAAT) by GeneXpert

CPT Code

87491 - CT
87591 - GC

Acceptable Specimens

  • Urine, unpreserved, female & male: 7 ml minimum volume
  • Female GeneXpert endocervical swab, provider collected
  • Female GeneXpert vaginal swab, self-collected
  • Throat (pharyngeal) swab
  • Rectal swab

Specimen Rejection

Only GeneXpert swabs will be tested. All others will be rejected. The laboratory will supply swabs upon request. Urine specimens less than 7 ml volume.

Specimen Storage

Store all specimens in the refrigerator (2-8°C).

Specimen Stability

  • Prior to processing, unpreserved urine is stable at 2-8°C for up to 8 days.
  • Preserved urine is stable at 2-8°C for up to 45 days.
  • Swabs are stable at 2-8°C for up to 60 days.

Specimen Transport

Transport specimens on cold pack to the laboratory. Please submit specimens promptly to ensure ample time for processing during the specimen’s acceptable time frame.

Setup Days



Reports will be available in 1-4 days.
Results may be available on the same day if sample is received by noon. Contact lab for more information.

Lab Slip

Monster Form (PDF: 108 Kb)