How long a dialysis catheter can stay in depends on the type. A temporary (non-tunneled) catheter is designed for up to 2 to 3 weeks. A tunneled catheter, the kind placed under the skin with a small cuff, can last years. In one study tracking tunneled catheters, the median survival was 58 months (nearly 5 years), and 97% were still working at the one-year mark.
Temporary vs. Tunneled Catheters
Temporary catheters are inserted directly into a large vein in the neck or groin, with no protective barrier between the skin surface and the bloodstream. They’re meant for urgent situations when dialysis needs to start right away and there’s no time to set up a longer-term option. The general rule is a maximum dwell time of about 3 weeks, though femoral catheters (placed in the groin) should come out within 5 days because of higher infection and clotting risk.
When dialysis will be needed for more than 3 weeks, the standard practice is to place a tunneled catheter. This type runs under the skin for several inches before entering the vein, creating a physical barrier against bacteria. A small fabric cuff sits within the tunnel and eventually bonds with surrounding tissue, anchoring the catheter in place and adding another layer of infection protection. Tunneled catheters are placed in the neck or chest area and exit the skin on the upper chest, making them easier to live with day to day.
How Long Tunneled Catheters Actually Last
Tunneled catheters are built for extended use, but their real-world lifespan varies widely. A retrospective study from a Chinese hemodialysis center found the average tunneled catheter lasted about 26 months, with the shortest lasting 3 months and the longest reaching 96 months (8 years). The median was 58 months, meaning half of all catheters were still functioning past the 4.5-year mark. About 43% survived 5 years.
These numbers give a realistic range, but your individual experience will depend on how well the catheter is maintained, how your body responds, and whether complications develop. Some catheters fail within months from clotting or infection. Others work reliably for years.
Why Most Catheters Are Meant to Be Temporary
Even tunneled catheters are generally considered a bridge, not a destination. The preferred long-term dialysis access is a fistula, a surgically created connection between an artery and vein in your arm. A fistula typically takes 2 to 3 months to mature before it can handle the high blood flow rates dialysis requires. A graft (a synthetic tube connecting artery to vein) is another option that matures faster but doesn’t last as long as a fistula.
If your kidney disease progressed quickly, you may not have had time to get a fistula placed and matured before needing dialysis. In that case, a catheter fills the gap for weeks or months while the fistula develops. Some patients, though, end up on catheters long term because their veins can’t support a fistula, or previous surgeries have limited their options.
How Infection Risk Grows Over Time
The longer a catheter stays in, the higher the chance of a bloodstream infection. A large meta-analysis covering 22 studies confirmed that catheter dwell time is a significant risk factor for catheter-related bloodstream infections, roughly doubling the odds compared to shorter placement periods. This holds true across every time threshold studied, from 7 days to over a year.
Bloodstream infections from dialysis catheters are serious. If caught early and treated with antibiotics, the catheter can often stay in place. But if you develop signs of severe infection, such as high fever, chills, or dropping blood pressure that doesn’t respond to treatment within about 36 hours, the catheter needs to come out. In those cases, a new catheter can sometimes be placed at the same site using a guidewire, preserving that vein for future access.
Vein Damage From Prolonged Use
A less visible but important concern with long-term catheter use is damage to the vein itself. The catheter sits inside a central vein, and over time the irritation it causes can trigger inflammation, tiny blood clots, and tissue overgrowth inside the vessel wall. This process, called central venous stenosis, narrows the vein and can eventually block it. A history of catheter placement is the single biggest risk factor for developing this narrowing later.
This matters because dialysis patients have a limited number of usable veins. Every narrowed or blocked vein is one fewer option for a future fistula, graft, or catheter. It’s one of the main reasons clinicians push to transition from a catheter to a fistula as quickly as possible.
Signs Your Catheter Needs Attention
The clearest indicator that a catheter is failing is poor blood flow during dialysis. A well-functioning catheter should deliver blood at a rate of 300 milliliters per minute or higher. When flow drops below that threshold, the catheter is considered dysfunctional. You might notice that your dialysis sessions take longer than usual, that the machine alarms more frequently, or that your care team repositions you or flushes the catheter repeatedly during treatment.
Low flow rates mean the catheter is partially blocked, kinked, or pressed against the vein wall. Sometimes flushing or repositioning fixes the problem. If it doesn’t, the catheter may need to be exchanged. Your dialysis team monitors flow rates at every session, so dysfunction is usually caught quickly.
How Catheters Are Maintained
Between dialysis sessions, each port of the catheter is filled with a “lock” solution that prevents clotting and bacterial growth. The most common options are blood-thinning solutions or citrate-based solutions. Keeping the catheter clean and the dressing dry is equally important. Your dialysis team will change the dressing and check the exit site at every session, looking for redness, swelling, or drainage that could signal early infection.
At home, you’ll need to keep the catheter site dry (covering it during showers), avoid pulling or tugging on the tubing, and watch for any warmth, tenderness, or discharge around the exit site. These small daily habits have an outsized effect on how long the catheter lasts and whether it stays infection-free.
What Happens When a Catheter Is Replaced
If a catheter stops working or develops an infection that doesn’t clear with antibiotics, it needs to be replaced. There are two approaches: placing a completely new catheter at a different site, or threading a guidewire through the old catheter and sliding a new one into the same vein. The guidewire method is simpler and avoids the risks of puncturing a new vein, making it useful when other access sites are limited or when bleeding risk is high.
The trade-off is that guidewire exchanges carry a higher rate of early dysfunction in the new catheter, roughly 38% compared to about 16% for a fresh-site placement in one study. Infection rates, however, are similar between the two methods. Your care team will weigh these factors based on your anatomy and medical history.