Urinary tract infection and pyelonephritis: the clean specimen, fluids, teaching and catheter-related infection
- Safe practice
In a urinary infection the nurse takes a clean sample, encourages fluids, gives the antibiotics ordered, watches for sepsis and protects catheters.
What it is
A urinary tract infection may stay in the bladder or reach the kidneys (pyelonephritis). Bladder infection causes burning, frequency, urgency, cloudy or bloody urine and lower abdominal pressure; kidney infection adds fever, chills, flank pain, nausea and vomiting, and in older people confusion may be the only sign. The nurse's work is a correct specimen (clean-catch or from the catheter sampling port, never from the bag), fluids unless restricted, the antibiotics on time and to the end, watching for sepsis, and preventing catheter-associated infection: a catheter only when indicated, a closed system, free flow and removal as soon as possible.
What it requires
- Recognise bladder versus kidney symptoms.
- A specimen collected without contamination, labelled and sent as the protocol sets.
- Antibiotics given on time and completed even when the patient feels better.
- Every urinary catheter has a current indication.
How it is applied (and why)
- Ask about burning, frequency, urgency and the look and smell of the urine — they point to a bladder infection.
- Check temperature and ask about chills, flank pain and nausea — they suggest the kidneys are infected.
- In an older adult with new confusion, think of a UTI and report it — it may be the only sign.
- Teach the clean-catch midstream method and check the sample — contamination from the skin gives false results.
- With a catheter, disinfect the sampling port and aspirate with a sterile syringe — urine in the bag is contaminated.
- Label the sample and send it as the protocol sets — if it cannot go at once, store it as the laboratory instructs.
- Encourage fluids, mostly water, unless the patient has a fluid limit — they are part of the advice for bladder and kidney infections.
- Give the antibiotics as ordered and teach to finish them — stopping early lets the infection come back.
- Check pulse, blood pressure, breathing and mental status — sepsis is the dangerous complication.
- Ask every day whether the catheter is still needed and keep the system closed and draining — duration drives catheter infection.
In nursing practice
- Most bladder infections improve within 24 to 48 hours of starting treatment; kidney infection may take a week or more.
- Sepsis risk is higher in very old adults and in people with weak immunity.
- Recurrence soon after treatment needs reporting.
- Catheter care: hand hygiene before and after handling, routine meatal hygiene with the daily wash, no antiseptic on the meatus.
Common mistakes
- Taking the urine sample from the drainage bag.
- Changing catheters or bags on a fixed schedule instead of when clinically needed.
- Leaving the bag on the floor or above the bladder, or the tubing kinked.
- Sending urine cultures from catheterised patients without symptoms.
- Not reporting fever, flank pain, low blood pressure or new confusion.
Test yourself
Think of the answer, then tap the question to see it.
Where does the nurse take a urine culture from a patient with an indwelling catheter?
From the disinfected needleless sampling port with a sterile syringe; never from the drainage bag, which is contaminated.
Which signs suggest the infection has reached the kidneys?
Fever, chills, flank or back pain, nausea and vomiting, and in older people confusion.
Should catheterised patients without symptoms be screened routinely for bacteria in the urine?
No; CDC advises against routine screening for asymptomatic bacteriuria in catheterised patients.
Where should the catheter drainage bag be kept?
Below the level of the bladder at all times and off the floor, with the tubing free of kinks.
Elsewhere in DurgiPedia
Connections
Educational content for students; it does not replace your institution's protocols, supervised clinical training or a prescriber's order. Dose-calculation examples use made-up numbers: they are educational, not a clinical order.
Sources: Urinary tract infection - adults, MedlinePlus Medical Encyclopedia (MedlinePlus, US National Library of Medicine, 2026); Clean catch urine sample, MedlinePlus Medical Encyclopedia (MedlinePlus, US National Library of Medicine, 2024); Guideline for Prevention of Catheter-Associated Urinary Tract Infections (2009): Summary of Recommendations (Centers for Disease Control and Prevention (CDC), HICPAC, 2009); Nursing Skills (Open RN), 11.5 Obtaining Urine Specimen for Culture (Open RN, Wisconsin Technical College System (CC BY 4.0), LibreTexts, 2021).
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Representative model, for educational purposes only.