Nursing care
Urinary Catheterization: the nurse's role, start to finish
Written and reviewed by Dana Whitfield, RN, MSN · 4 min read · Updated September 2026
Short answer
Urinary catheterization is the sterile insertion of a tube into the bladder to drain urine when a patient cannot void, needs precise output monitoring, or requires bladder decompression. The nursing priority is strict aseptic technique on insertion and removing the catheter as soon as clinically justified, since CAUTI risk climbs with every additional day it stays in place.
What the procedure achieves
Catheterization relieves urinary retention, allows accurate hourly output monitoring in critically ill patients, and enables bladder irrigation or instillation of medication. It is also used pre- and intra-operatively to keep the bladder empty during surgery and to protect skin integrity in patients with stage 3 or 4 pressure injuries where urine contact would worsen healing.
It is not a default convenience measure for incontinence. Indwelling catheters carry enough risk that most facilities require a documented clinical indication, and nurses are increasingly expected to question orders that lack one.
Pre-procedure nursing responsibilities
Confirm the indication is documented and current, verify consent, and gather the correct catheter size, usually 14-16 French for adults unless otherwise specified. Check for latex allergy before selecting the catheter material, and review the patient's anatomy and history for anything that might complicate insertion, such as prior urethral surgery or an enlarged prostate.
Explain the procedure to the patient in plain terms, including that they will feel pressure rather than sharp pain if a local anaesthetic gel is used. Perform hand hygiene and set up a clean, well-lit work area before opening the sterile kit, since maintaining sterility depends as much on preparation as on technique during insertion.
Equipment and positioning
Standard equipment includes a sterile catheterization kit, the catheter itself, sterile gloves, antiseptic cleansing solution, a syringe pre-filled with sterile water to inflate the balloon, and a closed drainage system. Everything inside the sterile field must remain sterile from the moment the kit is opened until the catheter is secured.
Position female patients supine with knees bent and hips externally rotated, sometimes called the frog-leg position, to expose the urethral meatus clearly. Position male patients supine with legs extended. In both cases, drape to expose only the perineal area, cleanse from the meatus outward using a new swab for each stroke, and never let a gloved hand touch a non-sterile surface once cleansing begins.
Complications and early signs
Catheter-associated urinary tract infection is the complication that drives most of the nursing decision-making around this procedure. Watch for cloudy or foul-smelling urine, new fever, suprapubic tenderness, or unexplained confusion in older adults, which can be the only presenting sign of infection.
Trauma during insertion causes urethral bleeding or, in male patients with an enlarged prostate, false passage formation, so insertion should never be forced against resistance. Bladder spasms, catheter blockage from sediment or clot, and accidental balloon inflation before the catheter is fully advanced are the other complications to watch for in the hours after placement.
Post-procedure care
Secure the catheter to the thigh to prevent traction on the urethra, keep the drainage bag below bladder level at all times, and maintain a closed, unobstructed system to reduce infection risk. Document insertion time, catheter size, balloon volume and initial urine characteristics immediately.
Reassess the indication for the catheter at least once every shift and remove it the moment the clinical reason no longer applies. This daily reassessment is the single most effective CAUTI prevention measure available, more effective than any dressing or cleansing routine performed while the catheter remains in.
What to teach before discharge
For patients discharged with a catheter still in place, teach hand hygiene before and after handling the drainage system, keeping the bag below bladder level even when walking or riding in a car, and emptying it before it becomes more than two-thirds full. Show them how to secure the tubing to avoid pulling.
Teach them to report fever, cloudy or foul-smelling urine, leakage around the catheter, or no urine output as reasons to call their provider promptly. If self-catheterization is being taught instead of an indwelling device, confirm the patient can demonstrate clean technique and correct catheter frequency before they leave, since intermittent catheterization carries a lower infection risk than a permanent indwelling catheter.
The next step on this is the same as on everything else here: answer questions and read the rationales. Our renal and genitourinary practice questions are the closest set to what this page covers.
Common questions
Why is urinary catheterization a sterile procedure and not just clean?
The catheter passes directly into the bladder, a normally sterile space, so any contamination introduced on insertion has a direct route to cause infection. Clean technique is reserved for intermittent self-catheterization by patients managing their own care at home, not for initial clinical insertion.
How often should an indwelling catheter be changed?
There is no fixed universal interval; most guidance favours changing it only when clinically indicated, such as blockage, infection, or manufacturer-specified balloon degradation, rather than on a routine schedule. Practice varies by facility policy, so check local protocol.
What is the single most important nursing action to prevent CAUTI?
Reassessing the need for the catheter every shift and removing it as soon as it is no longer indicated. Infection risk rises with each day the catheter stays in, so minimizing dwell time matters more than any cleansing routine.
What size catheter is used for a typical adult patient?
A 14-16 French catheter is standard for most adults, though the exact size is chosen based on the clinical reason for catheterization, such as clot retrieval requiring a larger lumen. Always confirm the ordered size before opening the kit.