What is the appropriate assessment for gonorrhea?

Assessment for Gonorrhea

Screen all sexually active women under age 25 and those at increased risk, and use nucleic acid amplification testing (NAAT) on appropriate specimens with confirmatory testing for extragenital sites. 1

Screening Recommendations

Who to Screen

• All sexually active women aged <25 years regardless of symptoms 1, 2
• Women >25 years with risk factors: previous gonorrhea infection, other STIs, new or multiple sex partners, inconsistent condom use, commercial sex work, drug use 1
• All pregnant women at increased risk at first prenatal visit 1
• Men who have sex with men (MSM): annual screening at minimum, with more frequent screening (every 3-6 months) in high-risk populations 2
• Persons living in high-prevalence communities (primary/secondary syphilis rate >4.6 per 100,000) 3

Important caveat: The U.S. Preventive Services Task Force does not recommend routine screening in low-risk men and women 1

Diagnostic Testing Methods

Preferred Testing Approach

NAATs are the primary diagnostic method due to superior sensitivity (>95%) and specificity (>99%) compared to culture 1

Specimen Collection by Site

Urogenital sites:

• Women: Endocervical swabs, vaginal swabs (including self-collected), or urine 1
• Men: Urethral swabs or first-catch urine 1
• NAATs are FDA-cleared for these specimen types 1

Extragenital sites (pharynx and rectum):

• Culture remains preferred for pharyngeal and rectal specimens 1
• NAATs are not FDA-cleared for these sites and may cross-react with non-gonococcal Neisseria species 1, 4
• Confirmatory testing is mandatory for all positive pharyngeal NAAT results due to false-positive risk from commensal Neisseria 5
• Some laboratories have validated NAATs for extragenital sites under CLIA requirements 1

Special Diagnostic Considerations

Symptomatic men:

• Gram stain of urethral discharge showing polymorphonuclear leukocytes with intracellular Gram-negative diplococci has >99% specificity and >95% sensitivity 1
• However, specific NAAT or culture testing is still recommended for definitive diagnosis and partner notification 1

Asymptomatic men:

• Gram stain has lower sensitivity and should not be used to rule out infection 1

Sites where Gram stain should NOT be used:

• Endocervical specimens, pharyngeal specimens, rectal specimens 1
• Prepubertal children (inadequate for diagnosis) 4

Culture Indications

Culture is mandatory in these situations:

• Treatment failures or persistent symptoms after recommended therapy 6, 1
• Suspected antimicrobial resistance 6, 1
• All extragenital sites when culture capability exists 1
• Medicolegal cases (sexual assault, child abuse) 4
• Prepubertal children - culture is preferred over NAAT for all sites 4

When culture is performed, antimicrobial susceptibility testing must be conducted and isolates preserved for additional testing 6, 1

Concurrent Testing Requirements

All patients tested for gonorrhea must also be tested for: 1

• Chlamydia trachomatis
• Syphilis
• HIV

This is non-negotiable given the high frequency of coinfection and the need for comprehensive STI assessment 1

Test of Cure (TOC)

TOC is NOT routinely recommended for uncomplicated gonorrhea treated with recommended regimens 7, 8, 1

TOC IS mandatory in these situations:

• Treatment with alternative regimens (e.g., cefixime, azithromycin monotherapy) - perform at 1 week 6
• Pharyngeal infections treated with spectinomycin - perform at 3-5 days 7
• Any treatment failure - perform at 1 week after retreatment 6
• Emerging recommendation: Some experts now advocate TOC in all cases to ensure eradication and identify resistance 9

When performing TOC with NAAT, wait at least 2 weeks after treatment to avoid false-positives from residual nucleic acid 10

Retesting for Reinfection

All patients diagnosed with gonorrhea should be retested 3 months after treatment regardless of whether partners were treated, due to high reinfection rates 1, 2

If patients don't return at 3 months, test whenever they next present within 12 months 1

Common Pitfalls to Avoid

• Do not use quinolones - widespread resistance makes them obsolete for gonorrhea treatment 6, 1
• Do not rely on negative Gram stain in asymptomatic men or any women 1
• Do not use NAAT alone for pharyngeal specimens without confirmatory testing 1, 5
• Do not skip partner evaluation - all partners within 60 days must be evaluated and treated 7, 8, 1
• Do not forget that many infections are asymptomatic in women, making screening essential 1