Chlamydia trachomatis, NA Amplification, Ocular specimens

Test Mnemonic


CPT Codes

  • 87491 - QTY (1)


  • Chlamydia trachomatis by NA Amplification (GEN-PROBE)
  • Chlamydia trachomatis by Nucleic Acid Amplification

Performing Laboratory

Mayo Clinic Dpt of Lab Med & Pathology

Specimen Requirements

Volume Type Container Collect Temperature Transport Temperature Special Instructions
OneSwab(s)APTIMA Collection Unisex swab RefrigeratedOne APTIMA Collection Unisex Swab from ocular (corneal/conjunctiva) only sites. Indicate specimen source.


Environmental Condition Description
Refrigerated60 days
Ambient60 days
Frozen1 year

Days Performed

Mon - Sat

Turnaround Time

2 - 4 days


Name Description
Transcription-Mediated Amplification 

Reference Range

Special Info

This assay does not detect Chlamydia pneumoniae. This test is used for specimens that are not FDA approved for this assay. Acceptable non-FDA-approved specimen types are ocular swabs. Specimens must be collected using an APTIMA swab collection kit. Specimen source is required. This test is New York State approved.

Clinical Info

This report is intended for use in clinical monitoring or management of patients; it is not intended for use in medico-legal applications. In general, this assay should not be used to assess therapeutic success or failure, since nucleic acids from these organisms may persist for 3 weeks or more following antimicrobial therapy. The presence of blood is not expected to interfere with this assay.