What should you know about a urine sensitivity test?

Sensitivity testing follows a urine culture. If bacteria grow, the laboratory exposes them to selected antibiotics and reports which medicines are likely to inhibit them. A result may also show reduced susceptibility, meaning a medicine may be less suitable. The report is a guide rather than a prescription: kidney function, allergies, pregnancy, other medicines, infection location, and previous treatment all matter.

A negative culture does not explain every urinary symptom, and a sample taken after antibiotics may be harder to interpret. Urinary tract infection symptoms can overlap with other problems, including obstruction or prostate-related urinary changes. Kidney infection symptoms require clinical assessment rather than waiting for a report alone.

Give the sample exactly as instructed, ideally before starting a new antibiotic when the clinician advises this. Tell the care team about antibiotic allergies, medicines, pregnancy, kidney conditions, and recent antibiotics. Take only the prescribed medicine and follow the schedule; do not share doses or keep unused tablets for a future illness.

The clinician may change treatment when the culture and sensitivity report arrives. This is called tailoring therapy. Read more about [Urine Test](/treatments/diagnostics-and-screening/urine-test/) and [Antibiotic Treatment](/treatments/medical-management/antibiotic-treatment/).

Contact your clinician if symptoms do not improve as expected, return after treatment, or you develop a new reaction to the medicine. Seek urgent care for fever, shaking chills, flank or back pain, vomiting, confusion, or severe weakness. These features may occur with a kidney infection and need prompt assessment.

Ask whether bacteria grew, which antibiotics were sensitive, whether your medicine should change, and when improvement should be reviewed. Also ask how allergies, kidney function, or prostate symptoms affect the plan. Relevant background may include [Urinary Tract Infection](/conditions/urinary-tract-infection/), [Kidney Infection](/conditions/kidney-infection/), or [Benign Prostatic Hyperplasia](/conditions/benign-prostatic-hyperplasia/).