Central line-associated bloodstream infections (CLABSIs) are among the most dangerous and costly hospital-acquired infections, but they are also among the most preventable. Each case adds roughly 10 extra hospital days and costs an estimated $45,814 per occurrence. Prevention relies on a bundle approach: a set of evidence-based practices applied together during insertion and throughout the life of the catheter. When every element is followed consistently, infection rates drop dramatically. In 2024, the CDC reported a 9% national decrease in CLABSI rates compared to the previous year, with 46 states now performing better than the 2015 baseline in acute care hospitals.
The Bundle Approach to Prevention
CLABSI prevention isn’t about any single technique. It works through a “bundle,” a small group of practices that, when performed together every time, produce results far greater than any one step alone. The CDC and the Institute for Healthcare Improvement both organize prevention into categories: appropriate use of central lines, proper insertion practices, ongoing maintenance, and daily reassessment of whether the line is still needed.
Skipping even one element weakens the entire bundle. Hospitals that have achieved zero CLABSI rates for sustained periods credit strict compliance with every component, not selective adoption.
Hand Hygiene at Every Contact
Hand hygiene is the foundation of every other prevention step. The World Health Organization’s framework identifies five key moments for hand hygiene in clinical care, and the one most directly relevant to central lines is performing hand hygiene immediately before any clean or aseptic procedure. This protects the patient from harmful organisms, including bacteria already living on the patient’s own skin, from entering the bloodstream through the catheter.
Hands must be cleaned before insertion, before accessing the line, before changing dressings, and after any contact with the catheter or its components. Alcohol-based hand rub or soap and water both work, but the critical factor is timing: cleaning must happen immediately before the procedure, not minutes earlier.
Skin Antisepsis Before Insertion
Preparing the skin at the insertion site is one of the highest-impact steps. Guidelines recommend using chlorhexidine in an alcoholic solution, specifically 2% chlorhexidine gluconate in 70% isopropyl alcohol for adults and older children. The minimum effective concentration is 0.5% chlorhexidine in an alcohol base.
Application technique matters as much as the solution itself. The antiseptic should be applied with a single sterile applicator rather than reused supplies. Scrubbing the skin aggressively is not recommended, particularly in patients with fragile skin, because damaging the outer skin layer can allow deeper penetration of both the antiseptic and bacteria. The solution needs adequate time to dry completely before the catheter is placed.
Full Barrier Precautions During Insertion
Maximal sterile barrier precautions during insertion are non-negotiable. This means the person placing the catheter wears a cap, mask, sterile gown, and sterile gloves, while the patient is covered with a large sterile drape from head to toe. Using a small drape or skipping any barrier component significantly increases contamination risk. Everyone in the room should wear a cap and mask, not just the person performing the procedure.
Choosing the Right Insertion Site
Where the catheter goes into the body affects infection risk. A meta-analysis comparing catheter sites found that the femoral (groin) location carries a higher infection risk than the internal jugular (neck) site, with a risk ratio of 1.90, meaning nearly double the bloodstream infection rate. The subclavian (below the collarbone) site showed no significant difference from the internal jugular site in infection risk.
For non-emergency situations, the femoral site should generally be avoided when possible. The subclavian site is often preferred for its lower infection and clotting risk, though patient anatomy and clinical circumstances sometimes dictate a different choice. In urgent situations where the femoral site is used, the catheter should be moved to a different location as soon as the patient is stable enough.
Hub and Connection Point Disinfection
Once the line is in place, the connection points (hubs) where medications and fluids are administered become the primary entry route for bacteria. Every time the hub is accessed, it must be scrubbed with an antiseptic before anything is connected. The most commonly studied protocols use 70% isopropyl alcohol or a combination of chlorhexidine and isopropyl alcohol.
The scrub duration is a point of active investigation, with clinical trials comparing 5-second and 15-second scrub times using different antiseptic agents. Regardless of the exact duration your facility adopts, the principle is consistent: scrub vigorously, allow the hub to dry, and never access a line through a hub that hasn’t been freshly disinfected. This step is commonly called “scrub the hub,” and lapses here are one of the most frequent causes of preventable CLABSIs.
Dressing Changes and Site Inspection
The dressing over the insertion site serves as a physical barrier against bacteria. Transparent semi-permeable dressings should be changed every seven days under normal conditions. Gauze dressings, when used, require more frequent changes: every 48 hours. Both types need immediate replacement if the dressing becomes loose, wet, soiled with blood, or visibly compromised in any way.
The insertion site should be inspected daily for signs of infection such as redness, swelling, tenderness, or drainage. With transparent dressings, this inspection can happen visually without removing the dressing. If gauze is used, the dressing needs to be lifted for proper inspection. A Cochrane review found no clear evidence that changing dressings more frequently than these intervals reduces infection, so extending the time between changes is reasonable as long as the dressing remains intact and clean.
Daily Review of Line Necessity
The single most effective way to prevent a CLABSI is to remove the central line as soon as it’s no longer needed. Every day a catheter remains in place increases cumulative infection risk. The CDC recommends performing daily audits to assess whether each central line is still necessary.
This means asking a straightforward question during rounds: does this patient still need this line today? If medications can be given by mouth, if lab draws can be done by standard blood draw, or if the clinical reason for the line has resolved, the catheter should come out. Many hospitals use a structured daily checklist to prompt this conversation, because without a formal system, unnecessary lines tend to stay in longer than they should.
Antimicrobial-Coated Catheters
Catheters coated with antimicrobial agents are available as a supplemental strategy. These catheters are designed to resist bacterial colonization on their surfaces. Some individual studies have found significant reductions in bloodstream infection with impregnated catheters, but a meta-analysis in pediatric patients found a trend toward a 50% reduction in infections that did not reach statistical significance due to wide variability between studies.
These catheters are not a substitute for the core prevention bundle. They may offer an additional layer of protection in settings where infection rates remain high despite full bundle compliance, or in patients at particularly high risk. They are generally considered a supplemental measure rather than a frontline prevention tool.
Building a Culture of Compliance
Technical knowledge alone doesn’t prevent CLABSIs. The most successful hospitals build systems that make compliance the default. This includes empowering any team member, regardless of role, to stop a procedure if sterile technique is broken. It includes standardized catheter insertion kits that contain everything needed for full barrier precautions so nothing is left to memory. And it includes tracking compliance rates and infection data transparently so that teams can see whether their practices are working.
Checklists used during insertion, similar to those the CDC publishes, reduce the chance of skipping a step under time pressure. Post-insertion, maintenance bundles that standardize dressing changes, hub disinfection, and daily necessity reviews keep the line safe for as long as it remains in place. The consistent finding across hospitals that have driven their CLABSI rates toward zero is that sustained results come from systems, not individual effort.