A Urine Culture & Sensitivity is a laboratory urine test used to identify the exact bacteria or yeast causing a urinary tract infection (UTI) and to help choose the most effective antibiotics for treatment. The test has two main parts:

1) Urine culture: A urine sample is placed on special media and monitored to see if germs grow. If they grow, the lab identifies the organism (for example, E. coli, other bacteria, or yeast such as Candida) and often reports how much growth is present.

2) Sensitivity (susceptibility) test: If an organism is found, the lab tests which antibiotics are likely to work best. Results typically label antibiotics as “susceptible” (likely effective), “intermediate” (may work at higher doses or in certain situations), or “resistant” (unlikely to work).

In plain language, the results tell your clinician whether you truly have an infection, what germ is causing it, and which medication is most likely to clear it. A negative culture usually means no significant bacterial growth was detected (though results can be affected by recent antibiotic use or how the sample was collected). A report may also mention contamination (for example, mixed skin bacteria), which can happen if the sample isn’t collected midstream or if the area isn’t cleaned well beforehand; in that case, a repeat “clean-catch” sample may be recommended.

Doctors most often order a urine culture and sensitivity test when symptoms suggest a UTI and they need to confirm the diagnosis and guide infection treatment. It’s especially important when the infection may be complicated, recurrent, or not responding to first-choice antibiotics.

Common reasons and situations include:

Symptoms of a UTI: burning or pain with urination (dysuria), frequent urination, urgency, cloudy or foul-smelling urine, lower abdominal/pelvic discomfort, blood in the urine, or new urinary incontinence.

Possible kidney infection (pyelonephritis): fever, chills, flank/back pain, nausea/vomiting, or feeling very unwell—these symptoms often warrant a culture to target the right antibiotic quickly.

Recurrent or persistent UTIs: repeated urinary tract infections, symptoms that return soon after treatment, or ongoing symptoms despite antibiotics. A sensitivity test helps detect antibiotic resistance and prevents trial-and-error treatment.

Higher-risk groups: pregnancy (UTIs can cause complications and even “silent” bacteria in urine may need treatment), diabetes, older adults, people with urinary catheters, kidney stones, enlarged prostate, or structural urinary tract issues. These cases may require more precise treatment choices.

Before or after certain urologic procedures: to reduce the risk of procedure-related infection or to evaluate infection after instrumentation.

Your clinician may also order this diagnostic test after an abnormal urinalysis (for example, positive nitrites or leukocyte esterase, or many white blood cells), to confirm the infection and determine the best antibiotics.

• Uncomplicated urinary tract infection (UTI)
• Cystitis (bladder infection)
• Pyelonephritis (kidney infection)
• Recurrent UTI
• Catheter-associated urinary tract infection (CAUTI)
• Asymptomatic bacteriuria (especially in pregnancy or before certain procedures)
• Urethritis (infection/inflammation of the urethra)
• Prostatitis (infection/inflammation of the prostate)
• Fungal urinary tract infection / urinary yeast infection (e.g., Candida)

• Getting fast, targeted relief from UTI symptoms by selecting the most effective antibiotics
• Reducing antibiotic resistance by avoiding unnecessary or ineffective antibiotic use (antibiotic stewardship)
• Preventing complications such as kidney infection, sepsis, or infection spread—especially in higher-risk patients
• Supporting a healthy pregnancy by detecting and treating bacteriuria/UTIs promptly
• Managing chronic conditions (e.g., diabetes) by identifying infections early when risk is higher
• Lowering the risk of recurrent urinary tract infections through accurate diagnosis and tailored treatment
• Improving urinary tract health after catheter use or urologic procedures by confirming appropriate infection treatment