Anal Swab Collection for Gonorrhea and Chlamydia PCR Testing

Specimen Collection Technique

• The Centers for Disease Control and Prevention recommends using the swab supplied or specified by the manufacturer of the PCR test being used, as different platforms may have specific requirements 1, 2, 3.
• No specific timing restrictions apply to rectal swab collection, unlike urethral specimens which require a delay after voiding 4, 5.
• Insert the swab 1-2 cm into the anal canal to reach the columnar epithelium where chlamydia organisms reside 1, 2, 6.
• Rotate the swab against the rectal wall for 10-30 seconds to ensure adequate cellular material is collected 1, 7.
• Withdraw the swab carefully and place immediately in the appropriate transport medium (culture, EIA, or DNA probe testing as specified by the manufacturer) 1, 8.

Specimen Transport and Handling

• Specimens are stable at room temperature for up to 7 days when using DNA hybridization probe methods 9.
• For wet mount preparation, specimens should be processed within a short time frame, with a maximum of a few hours 9.

Quality Assurance

• Proper specimen collection is critical - even the highest-performing diagnostic tests cannot produce accurate results with improperly collected specimens 1, 3, 7.
• The objective is to obtain columnar epithelial cells from the rectal mucosa, not just secretions or exudate 1, 6, 10.
• Avoid collecting only secretions or discharge - the swab must contact the rectal mucosa to obtain columnar epithelial cells 1, 6, 11.