How often should a suprapubic catheter be flushed?

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Last updated: September 30, 2026 • View editorial policy

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Suprapubic Catheters Should NOT Be Routinely Flushed

Catheter irrigation should not be used as a preventive measure against infection in suprapubic catheters. 1

Key Recommendation

The most recent and authoritative guideline explicitly states that using catheter irrigation as a preventive measure against infection is not advisable 1. This applies to all indwelling urinary catheters, including suprapubic catheters. The only exception is when continuous irrigation is medically necessary to prevent obstruction (such as after urologic surgery with bleeding), and in those cases, a closed system must be maintained 1.

Why Flushing Is Not Recommended

  • Breaking the closed system increases infection risk: Opening the drainage system to flush the catheter introduces bacteria and dramatically increases the risk of catheter-associated urinary tract infections (CAUTI) 1
  • No evidence of benefit: Multiple randomized trials have shown that adding antimicrobials or antiseptics to drainage bags or using bladder irrigation does not reduce infection rates 2
  • Biofilms form regardless: Once catheters are inserted, biofilms develop on inner and outer surfaces that protect bacteria from antimicrobials and flushing 2

What To Do Instead

For Routine Maintenance:

  • Maintain unobstructed urine flow by keeping the drainage bag below bladder level 1
  • Keep the closed drainage system intact - do not break the seal between catheter and drainage bag 1
  • Perform routine hygiene of the suprapubic site only 1

For Catheter Blockage:

  • Replace the catheter rather than attempting to flush it 2
  • For patients with recurrent early blockage from encrustation, consider changing catheters every 7-10 days, though this lacks strong evidence 2
  • Routine catheter changes are typically done every 2-6 weeks for long-term suprapubic catheters 3, though optimal timing remains unstudied 2

Critical Pitfall to Avoid

Do not confuse therapeutic continuous bladder irrigation (used post-operatively for bleeding) with routine flushing for maintenance. Continuous irrigation requires specific indications and must maintain a completely closed three-way system 1.

References

3
Research

Change of the suprapubic catheter: Not always safe!

Indian journal of urology : IJU : journal of the Urological Society of India, 2024

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This information is intended for healthcare professionals. Any medical decision-making should rely on clinical judgment and independently verified information. The content provided herein does not replace professional discretion and should be considered supplementary to established clinical guidelines. Healthcare providers should verify all information against primary literature and current practice standards before application in patient care. Dr.Oracle assumes no liability for clinical decisions based on this content.