What is the hub of a catheter?

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Last updated: June 14, 2026 • View editorial policy

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What is the Hub of a Catheter

The catheter hub is the external connector or junction point where the catheter connects to infusion equipment, syringes, or dialysis circuits 1, 2.

Anatomical Definition

The hub serves as the female Luer-lock connection at the end of the catheter that protrudes outside the body 2. In central venous catheters (CVCs), each lumen terminates in its own hub, which is typically covered with a sterile cap when not in use. The hub includes:

  • The connection port where syringes or IV tubing attach
  • The catheter cap (Luer-lock cap) that seals the hub when disconnected
  • The clamp mechanism located just proximal to the hub on the catheter limb

Clinical Significance: Major Portal for Infection

The catheter hub represents a critical infection risk point and is a common portal of entry for bacteria causing catheter-related bloodstream infections (CRBSI) 1. This is particularly important because:

  • Hub contamination accounts for 54% of catheter-related sepsis episodes in some studies 3
  • The hub becomes increasingly important as a source of infection in long-term catheters compared to short-term devices 4
  • Contamination occurs through multiple mechanisms: contact with nonsterile surfaces, prolonged air exposure, improper cleansing, or respiratory droplets from patients or providers 2

Essential Hub Care Protocol: "Scrub the Hub"

The hub must be vigorously scrubbed with antiseptic for at least 15 seconds before every connection and disconnection 1. This "scrub the hub" protocol is critical for reducing CRBSI and has been shown to decrease infection rates by almost 4-fold 2.

Recommended disinfection agents (in order of preference):

  • 2% chlorhexidine gluconate in 70% isopropyl alcohol (preferred) 5, 6
  • 70% alcohol (acceptable alternative) 1, 7
  • 10% povidone-iodine (if chlorhexidine contraindicated) 1

Key technical points:

  • Apply mechanical friction while scrubbing 6
  • Allow the antiseptic to dry completely before connection 6
  • Ensure the disinfected hub does not touch any nonsterile surfaces after cleaning 2
  • Minimize hub exposure time to air 2
  • Use no-touch technique - never touch the hub with hands or gloves after disinfection 2

Hub Management During Dialysis

For hemodialysis catheters specifically, the hub care protocol includes 2:

  1. Before connection: Clamp catheter → remove cap → scrub hub for 15 seconds → attach to dialysis circuit
  2. Before disconnection: Clamp catheter → disconnect bloodline → clean hub → flush with saline → instill locking solution → apply new sterile cap
  3. Replace caps every time the catheter is accessed and de-accessed 2

Common Pitfalls to Avoid

  • Never allow prolonged hub exposure - work quickly after removing caps
  • Never reuse disinfectant swabs - use single-use applications only 2
  • Never touch the hub after disinfection, even with gloved hands
  • Never skip hub disinfection at disconnection - it's as important as at connection 1
  • Avoid talking or breathing over exposed hubs 2

References

2
Guideline

kdoqi clinical practice guideline for vascular access: 2019 update.

American Journal of Kidney Diseases, 2020

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Professional Medical Disclaimer

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.