A Urethral Swab Culture & Sensitivity test is a diagnostic laboratory test that checks for bacterial infection in the urethra (the tube that carries urine out of the body). A clinician gently collects a sample of fluid/cells from the urethral opening using a small sterile swab (often referred to as a urethral swab). The sample is then sent to the lab for:

• Culture: the lab tries to grow bacteria from the sample to identify the specific germ causing symptoms.
• Sensitivity (antibiotic susceptibility) testing: if bacteria grow, the lab tests which antibiotics are most likely to work and which the bacteria may resist.

This test is commonly used when a provider suspects urethritis (inflammation/infection of the urethra) or certain sexually transmitted infections (STIs). While the culture can detect some STI-related bacteria (including gonorrhea), many clinics also use NAAT/PCR tests for chlamydia and gonorrhea because they are often more sensitive. Your clinician may order culture & sensitivity especially when symptoms are significant, initial treatment fails, or antibiotic resistance is a concern.

What results generally mean:

• No growth / negative culture: no bacteria grew in the lab. This can mean there is no bacterial infection, the infection is caused by an organism not well detected by routine culture, or sampling/early antibiotic use reduced detection.
• Positive culture (bacteria identified): bacteria grew and were identified. This supports a bacterial cause of urethral discharge, burning with urination, or other symptoms.
• Sensitivity results: the report typically lists antibiotics as “susceptible,” “intermediate,” or “resistant,” helping your clinician choose the most effective treatment.

A urethral swab culture & sensitivity is usually ordered when symptoms, exam findings, or exposure history suggest an infection of the urethra or lower genital tract and the clinician needs to identify the organism and guide antibiotic therapy.

Common symptoms that may prompt testing include:

• Burning or pain with urination (dysuria)
• Urethral discharge (clear, white, yellow, or green discharge)
• Itching, irritation, or redness at the urethral opening
• Pelvic or lower abdominal discomfort
• Pain with ejaculation, or testicular/scrotal discomfort (in some cases)
• Symptoms after a new sexual partner or unprotected sex

Situations where this test is especially helpful:

• Suspected gonorrhea or other bacterial urethritis, particularly if antibiotic resistance is a concern
• Persistent or recurrent symptoms after initial treatment
• Complicated infection or higher-risk patients where precise identification matters
• Evaluation after exposure to an STI, as part of targeted STI screening when symptoms are present
• Partner management: helping guide treatment when a partner has a confirmed STI

Preparation can vary by clinic. In some settings, you may be asked to avoid urinating for a short period before sample collection to improve the chance of detecting organisms. Always follow your clinician’s instructions.

• Urethritis (infectious urethritis)
• Gonorrhea (Neisseria gonorrhoeae infection)
• Non-gonococcal urethritis (NGU), including infections associated with Chlamydia trachomatis
• Chlamydia (often evaluated alongside culture using NAAT/PCR)
• Bacterial urinary/genital tract infections involving organisms such as E. coli (less common as a urethral cause, depending on context)
• Antibiotic-resistant gonorrhea or other resistant bacterial infections
• Cervicitis or genital tract infection (when symptoms and anatomy suggest lower genital tract involvement)

• Early detection and treatment of STIs (including gonorrhea) to reduce complications
• Targeted antibiotic selection (antibiotic stewardship) based on sensitivity results
• Relief of urinary and genital symptoms by identifying the correct cause of urethral irritation
• Preventing transmission to sexual partners through accurate diagnosis and appropriate therapy
• Supporting comprehensive sexual health care and appropriate STI screening strategies
• Managing recurrent or persistent urethral infections by confirming the organism and ruling out resistance