Urinary catheterization: a guide for nursing students

LS
By Lindsay Smith, AGPCNP
Updated May 1, 2026

Urinary catheterization is one of the most commonly performed invasive procedures in nursing, carried out across every care setting from the emergency department to long-term care. An estimated 15–25% of hospitalized patients receive a urinary catheter at some point during their admission (Gould et al., CDC, 2019), and catheter-associated urinary tract infection (CAUTI) remains the single most common healthcare-associated infection in acute care hospitals. For nursing students, mastering this skill means more than memorizing a sequence of steps — it requires understanding why each step matters, when catheterization is and is not appropriate, and how every clinical decision affects patient safety. This guide walks through catheter types, indications, insertion technique for both female and male patients, CAUTI prevention, and ongoing catheter care, followed by high-yield NCLEX exam points.

Quick-reference: non-negotiables for safe catheterization

  • Confirm indication and obtain informed consent before proceeding
  • Use strict sterile technique throughout — gloves, drapes, and supplies
  • Confirm urine return before inflating the balloon
  • Advance catheter 1–2 inches beyond urine return before inflating
  • Inflate balloon with sterile water only — never saline
  • Keep the drainage bag below bladder level at all times
  • Review catheter necessity daily; remove as soon as no longer indicated

Types of urinary catheters

Choosing the correct catheter type is a clinical decision that depends on the intended duration, purpose, and patient anatomy.

Catheter type Indication Typical dwell time Insertion route Notes
Foley (indwelling) Accurate output monitoring, urinary retention, immobilized patient, perioperative care Days to weeks (reassess daily) Urethra Balloon inflated with sterile water to hold in place; highest CAUTI risk among catheter types
Straight / intermittent Bladder decompression, post-void residual measurement, specimen collection Removed immediately after use Urethra No balloon; lower CAUTI risk than indwelling; preferred for neurogenic bladder management
Suprapubic Long-term drainage when urethral access is contraindicated or unavailable Weeks to permanent Abdominal wall (surgical insertion) Inserted through abdominal wall into bladder by provider; sterile dressing change required at insertion site
Coude Male patients with urethral obstruction, enlarged prostate, or urethral stricture Variable Urethra Curved tip designed to navigate past prostatic obstruction; tip must be positioned upward (toward 12 o'clock) during insertion

Catheter sizing follows the French (Fr) scale, where each French unit equals one-third of a millimeter in diameter. Standard adult catheters range from 14 Fr to 18 Fr. The smallest catheter that will drain effectively should be selected — a larger catheter does not drain better and increases trauma and CAUTI risk. Catheters are made from latex or silicone; use silicone for patients with latex allergies or for long-term catheterization, as silicone causes less tissue reaction.

Indications and contraindications

Urinary catheterization is an invasive procedure and carries inherent infection risk. It should be performed only when a clear clinical indication exists.

Accepted indications (CDC Guideline for Prevention of CAUTI, 2009):

  • Acute urinary retention or bladder outlet obstruction
  • Accurate urine output measurement in critically ill patients
  • Perioperative use for selected surgical procedures
  • Prolonged immobilization (e.g., pelvic fracture, thoracic or lumbar spine instability)
  • Comfort care for end-of-life patients with severe urinary incontinence
  • Open sacral or perineal wounds in incontinent patients (short-term, clinically documented rationale)

Indications that are NOT acceptable include convenience for nursing staff or patient management of incontinence in non-wound-related scenarios. These are among the most common causes of inappropriate catheter placement.

Contraindications and cautions:

  • Urethral injury or suspected urethral disruption — particularly in trauma patients with blood at the urethral meatus, perineal ecchymosis, or mechanism suggestive of pelvic fracture. Do not attempt urethral catheterization until urethral injury has been ruled out.
  • Recent urethral or prostate surgery — follow surgeon’s specific instructions; inappropriate catheterization can disrupt surgical anastomoses.
  • Known urethral stricture — may require coude catheter or urology referral rather than standard straight-tipped catheter.
  • Uncooperative patient without adequate sedation — forced insertion risks injury.

Equipment and preparation

Most facilities supply pre-assembled sterile catheterization kits. Standard kit contents include:

  • Sterile gloves
  • Sterile drapes (fenestrated drape for the patient; sterile field drape for supplies)
  • Antiseptic solution (povidone-iodine or chlorhexidine, per facility protocol)
  • Sterile cotton balls or swabs for cleansing
  • Sterile water syringe (10 mL, pre-filled) — for balloon inflation
  • Sterile lubricating jelly or lidocaine gel
  • Collection bag with drainage tubing
  • Urethral catheter (appropriate type and size)
  • Specimen cup (if urine sample is needed)

Patient positioning:

  • Female patients: Dorsal recumbent (supine with knees bent and feet flat, hips externally rotated). Good lighting is essential for visualizing the urethral meatus.
  • Male patients: Supine with legs extended and slightly apart.

Before beginning, explain the procedure to the patient and obtain consent. Provide privacy. Raise the bed to a working height to protect your back and maintain control of the sterile field. Empty the bladder with a straight catheter if the patient has known latex allergy and a latex-free kit is not immediately available — but always use a latex-free kit when allergy is documented.

Step-by-step insertion procedure

Strict sterile technique is mandatory throughout. A single breach in sterile technique requires starting over with a new kit.

Female catheterization

  1. Position and expose — Place the patient in dorsal recumbent position. Expose only the perineum. Ensure adequate lighting.

  2. Open the kit using sterile technique — Open the outer packaging and place the kit on the overbed table. Open the inner packaging without contaminating contents. Don non-sterile gloves, open all supplies onto the sterile field, then remove non-sterile gloves and perform hand hygiene.

  3. Don sterile gloves — Using sterile gloving technique. From this point forward, only your sterile-gloved hands touch the sterile field.

  4. Organize the sterile field — Pour antiseptic solution over cotton balls or swabs. Test balloon integrity by injecting the pre-filled sterile water syringe, then deflate. Apply sterile lubricant to catheter tip (2–5 cm). Attach catheter to collection bag.

  5. Drape the patient — Place the sterile drape under the patient’s buttocks without contaminating your gloves. Place the fenestrated drape over the perineum.

  6. Identify the urethral meatus — With your non-dominant hand, spread the labia minora and hold open throughout the procedure. This hand is now contaminated and must not touch any sterile supplies. Use your dominant (sterile) hand to cleanse.

  7. Cleanse the meatus — Using forceps or your sterile dominant hand, cleanse from the meatus outward using front-to-back strokes (toward the anus). Use a new swab or cotton ball for each stroke. Cleanse the right labial fold, then left, then directly over the urethral meatus. Do not allow the labia to close over the cleansed area.

  8. Insert the catheter — With your dominant hand, pick up the catheter 2–3 inches from the tip (keeping it coiled in the sterile kit tray to avoid floor contamination). Ask the patient to breathe slowly and bear down slightly to relax the sphincter. Insert the catheter into the urethral meatus using gentle, continuous pressure — not forceful thrusting. Advance until urine returns (typically 2–3 inches), then advance an additional 1–2 inches before inflating the balloon.

  9. Inflate the balloon — Inject the full 10 mL of sterile water using the pre-filled syringe. Never use saline — saline can crystallize within the inflation channel and prevent balloon deflation at removal. Never inflate with less than the specified volume; partial inflation creates an asymmetric shape that can occlude the catheter eye.

  10. Gently retract the catheter — Pull back gently until resistance is felt, confirming the balloon is seated at the bladder neck.

  11. Secure, label, and position — Secure the catheter to the inner thigh using a catheter securement device or tape to prevent tension and urethral injury. Position the drainage bag below bladder level but off the floor. Label the catheter with the date of insertion.

  12. Document — Record indication, catheter type and size, balloon volume, urine return characteristics (color, clarity, odor, quantity), date and time of insertion, and patient tolerance.

Male catheterization

Steps 1–5 are the same as above. Key differences for male patients:

  • Position the penis — With your non-dominant hand, hold the penis perpendicular to the body (90° angle) and retract the foreskin if present. This hand is now contaminated.
  • Cleanse in expanding circles — Cleanse from the urethral meatus outward using circular strokes, using a new swab each time.
  • Apply generous lubrication — Instill 10–15 mL of sterile lubricant or 2% lidocaine gel into the urethra before insertion. This reduces friction through the longer male urethra (approximately 18–20 cm versus 4 cm in females) and eases passage through the prostatic urethra.
  • Insert with penis elevated — Insert the catheter 6–8 inches with the penis held at a 90° angle. When you feel resistance at the external sphincter, lower the penis to a 45° angle to align with the prostatic urethra and continue advancing. Ask the patient to breathe deeply and bear down.
  • Advance fully until urine returns, then advance an additional 1–2 inches before balloon inflation.
  • Inflation, retraction, securing, and documentation — Same as female technique.

If you encounter resistance in male catheterization: Do not force. Resistance often indicates the external urethral sphincter is contracted. Pause, ask the patient to relax and breathe, and try again with gentle pressure. If resistance persists, a coude catheter may be needed. Notify the provider if standard catheter fails.

CAUTI prevention

Catheter-associated urinary tract infection is the most common healthcare-associated infection in hospitals, accounting for approximately 40% of all HAIs according to the CDC. Most CAUTIs are preventable. The primary prevention strategy is avoiding unnecessary catheter use and removing catheters as soon as they are no longer needed.

Prevention bundle element Rationale Nursing action
Avoid unnecessary catheterization Each day with a catheter increases CAUTI risk by 3–7%. No indication = no catheter. Confirm documentation of accepted indication before inserting. Advocate for alternatives (condom catheter, prompted voiding, bladder scanner for PVR).
Daily necessity review Catheters left in place by default rather than active decision-making are the leading cause of prolonged unnecessary catheterization. At each shift, review whether the catheter is still meeting a documented clinical need. If no current indication, notify provider to obtain a discontinuation order.
Maintain closed drainage system Breaking the sealed connection between catheter and drainage tubing is the primary route of bacterial entry. Never disconnect catheter from drainage tubing except for catheter replacement. If the junction must be separated, use sterile technique and document.
Avoid dependent loops Urine pooled in dependent loops can reflux back into the bladder, carrying organisms with it. Keep tubing free of kinks and coils. Ensure tubing follows a downward path from catheter to collection bag without loops.
Perineal hygiene Periurethral colonization with bowel flora is the primary source of catheter-associated organisms. Perform routine perineal cleansing with soap and water at least daily and after any bowel movement. Do not use antiseptic agents routinely — evidence does not support this and may disrupt normal flora.
Proper bag positioning Bag above bladder level creates retrograde urine flow; floor contact introduces environmental pathogens. Collection bag must remain below the level of the bladder at all times and off the floor. Secure to the bed frame, not side rails, so the bag descends when the bed is raised.

Routine catheter irrigation is not recommended for CAUTI prevention and is only performed when specifically ordered for a clinical indication such as clot evacuation following urologic surgery. Routine urine cultures are also not indicated in asymptomatic patients with catheters — this leads to over-treatment of asymptomatic bacteriuria, which is expected in long-term catheter users and does not require antibiotic therapy unless the patient is symptomatic.

Monitoring and ongoing nursing care

Once the catheter is in place, ongoing nursing assessment includes:

Urine output monitoring:

  • Document output every 1–4 hours depending on clinical context; hourly monitoring is standard in the ICU and post-operative settings.
  • Normal urine output is approximately 0.5 mL/kg/hour in adults. Output below 0.5 mL/kg/hour sustained over two hours requires assessment and likely provider notification.
  • Expected urine characteristics: pale to yellow color, clear, no strong odor.

Signs requiring assessment and likely provider notification:

  • Cloudy, foul-smelling, or dark urine (suggests infection, dehydration, or hematuria)
  • Hematuria beyond expected post-procedural amount
  • Output below 30 mL/hour sustained over two hours
  • Patient reporting suprapubic pain, pelvic discomfort, or burning around the catheter
  • Fever ≥38.0°C (100.4°F) without other apparent source in a catheterized patient
  • Catheter bypassing (urine leaking around, not through, the catheter — assess for constipation, catheter blockage, or bladder spasm)

Catheter patency: Assess patency each shift. If output suddenly decreases in a previously adequate catheter, check for kinking, dependent loops, or clots. A bladder scan confirms whether urine is retained in the bladder (suggesting obstruction) versus truly not being produced.

Catheter irrigation: Irrigate only when ordered by the provider. Routine irrigation is not evidence-based and increases CAUTI risk by opening the closed drainage system. When ordered, use sterile normal saline with aseptic technique.

Removal and discontinuation

Early removal of the catheter is the most effective CAUTI prevention intervention. When removal is ordered:

  1. Confirm balloon volume — Check the medical record or catheter label for the inflation volume. Standard Foley balloons hold 10 mL.
  2. Deflate completely — Attach an empty syringe to the balloon port and allow passive deflation, then apply gentle suction to confirm the full volume has been withdrawn. Attempting to remove a catheter with a partially inflated balloon causes urethral injury.
  3. Remove gently — Ask the patient to breathe slowly while you withdraw the catheter in a single smooth motion. Inspect the catheter tip for integrity.
  4. Post-removal monitoring: Document the time of removal and subsequent voiding. Patients should spontaneously void within 4–6 hours of catheter removal. If no void occurs within 6 hours, assess for urinary retention with a portable bladder scanner. Post-void residual greater than 300 mL warrants re-evaluation and possible provider notification.
  5. Patient education: Advise the patient that mild urgency and frequency may occur for the first 24–48 hours post-removal due to bladder irritation. Encourage adequate oral hydration.

NCLEX tips

The following points are high-yield for the NCLEX-RN and represent common question traps:

  • Balloon inflation: sterile water only. Saline is contraindicated because it can crystallize within the inflation channel and prevent balloon deflation. This is a direct patient safety issue and a frequent NCLEX distractor.
  • Advance beyond urine return before inflating. Urine return confirms the catheter tip is in the bladder, but the balloon is proximal to the tip — if you inflate immediately at first urine return, the balloon may still be partially in the urethra, causing injury. Advance 1–2 additional inches before inflating.
  • Female: if the catheter enters the vagina, leave it there. The misplaced catheter serves as a landmark identifying where the vaginal opening is. Insert a new sterile catheter into the urethral meatus, then remove the misplaced one.
  • Drainage bag must be below the bladder, off the floor. Both parts matter — bag above bladder causes retrograde flow; bag on the floor introduces pathogens.
  • Largest catheter is not best. Use the smallest French size that will drain effectively. Larger catheters cause more trauma, more irritation, and increase CAUTI risk.
  • CAUTI is the most common HAI in hospitals. This is a testable fact and forms the basis of many infection control questions.
  • Suprapubic catheters require sterile dressing changes at the insertion site in addition to routine catheter care. The insertion site is a wound.
  • Coude catheter tip must point toward 12 o’clock (upward) during insertion in male patients. The curved tip is designed to navigate past the prostate — inserting with the tip pointing downward defeats its purpose and risks urethral injury.
  • Balloon volume matters. Standard Foley: 10 mL sterile water. Pediatric catheters may use 3–5 mL. Always verify the labeled volume — do not estimate.
  • Asymptomatic bacteriuria in catheterized patients is expected and does not require treatment. Antibiotic treatment is indicated only with signs and symptoms of UTI in a catheterized patient, not for a positive culture alone.
  • Intermittent catheterization is preferred over indwelling for neurogenic bladder. This is a nursing priority question pattern — indwelling catheters carry higher long-term CAUTI risk.
  • Post-removal voiding window is 4–6 hours. No spontaneous void within 6 hours of removal requires bladder scan assessment.