What is the difference between a fistula, a graft, and a catheter?

An AV fistula joins one of your own arteries and veins, usually in the arm, and is the best long-term option. An AV graft uses a soft synthetic tube to connect an artery and vein and can be used sooner than a fistula. A catheter is a tube placed in a large vein — quick to use but meant to be temporary, with a higher risk of infection and clotting.

Why is an AV fistula preferred over a graft or catheter?

A fistula made from your own vessels tends to last the longest and has the fewest problems — lower rates of infection, clotting, and narrowing than a graft or catheter. Catheters carry the highest infection risk and are meant to be temporary, which is why a fistula is the goal whenever it's possible for you.

How long does an AV fistula take to mature?

Usually about six weeks to a few months. The fistula needs time for the vein to enlarge and strengthen enough to be used for dialysis. Some fistulas mature faster, some slower, and a few don't mature on their own and need a procedure to help — which is one more reason to plan well ahead of when dialysis is expected.

Does Georgia Nephrology place or surgically repair the access?

No — placing and surgically repairing an access is done by a vascular surgeon. Georgia Nephrology's role is to manage and monitor your access over time and to coordinate the referral and timing with the surgical team, staying involved in your care throughout.

How do I keep my dialysis access healthy?

Protect the access arm: don't let anyone take blood pressure or draw blood from it, avoid tight sleeves, watches, or jewelry on that arm, and don't sleep on it. Check it daily for the buzzing 'thrill,' keep the skin clean, and tell your care team right away about any change you notice.

What are the warning signs of an access problem?

Tell your team promptly if the 'thrill' (the buzzing you feel over a fistula or graft) weakens or disappears, if there's new swelling, redness, warmth, pain, or drainage, if bleeding after dialysis takes longer to stop, or if there are problems during a dialysis session. Caught early, many access problems can be fixed before they interrupt treatment.

Can a fistula or graft get blocked?

Yes. Over time an access can narrow (stenosis) or develop a clot (thrombosis), which can slow or stop the flow needed for dialysis. This is exactly what monitoring is for — catching a narrowing early so it can be treated by the vascular team before the access clots off.

What happens if my access stops working?

If an access narrows or clots, we coordinate promptly with vascular surgery for evaluation and repair, and arrange a temporary way to continue dialysis if one is needed. Because our physicians are present at the dialysis centers, problems are caught and acted on quickly rather than falling between offices.

Dialysis Vascular Access Management

Q: What is dialysis vascular access?

It's the connection used for hemodialysis — a fistula, graft, or catheter — that lets blood leave your body, pass through the dialysis machine to be cleaned, and return. A reliable access is essential, because good dialysis depends on it.

The short answer

A vascular access is how your blood reaches the dialysis machine for hemodialysis — usually an AV fistula, AV graft, or catheter. The access is created by a vascular surgeon; Georgia Nephrology's role is to manage and monitor it — watching that it flows well, catching problems like narrowing or clotting early, caring for catheters, and coordinating placement and repairs with the surgical team so your care stays connected.

At a glance

What it is The fistula, graft, or catheter that connects your blood to the dialysis machine.
Best long-term An AV fistula — made from your own vessels, with the fewest problems over time.
Maturation A new fistula usually needs about 6 weeks to a few months before it can be used.
Our role Management and monitoring — not placement, which a vascular surgeon performs.
Planning Arranging access early so it's ready before dialysis starts — not in a crisis.
Your part Protect the access arm and tell us about any change in how it feels or sounds.

What is vascular access?

If you’re on hemodialysis, your blood needs a reliable way to leave your body, pass through the dialysis machine to be cleaned, and return. That connection is your vascular access — and it’s often called a dialysis lifeline, because good dialysis depends entirely on it working well.

An access is created in advance by a vascular surgeon. Georgia Nephrology’s role is different and just as important: we manage and monitor your access over the long run — making sure it keeps flowing as it should, catching problems early, caring for catheters, and coordinating with the surgical team whenever an access needs to be placed or repaired. Placement and surgical repair are done by the surgeon; keeping the access healthy day to day and year to year is where we come in.

Fistula, graft, or catheter?

There are three main kinds of access, and they’re not interchangeable — each fits a different situation.

AV fistula

The surgeon joins one of your own arteries and veins, usually in the arm. Over weeks, the vein enlarges and strengthens into a durable access. It’s the best long-term option — but it needs time to be ready.

AV graft

A soft synthetic tube links an artery and a vein when your own vessels aren’t suitable for a fistula. It can usually be used sooner than a fistula, though it tends to need more attention over time.

Catheter

A tube placed in a large vein, often in the neck. It can be used right away, so it’s used when dialysis is needed quickly — but it’s meant to be temporary, with a higher risk of infection and clotting.

(Peritoneal dialysis, a home option, uses a different soft catheter in the abdomen rather than a blood-vessel access — see our dialysis care and home dialysis pages.)

Why is a fistula preferred?

When it’s possible for you, a fistula is the goal — and the reasons are practical. Because it’s built from your own tissue, a fistula tends to last the longest and cause the fewest problems, with lower rates of infection, clotting, and narrowing than a graft or catheter. A catheter, by contrast, stays partly outside the body and sits in a large vein, which gives bacteria an easier path to the bloodstream — so catheters carry the highest infection risk of the three and are best used only as a bridge.

Fistula first

When your vessels allow it, a fistula made from your own artery and vein is the most durable, lowest-risk access — which is why it’s the goal whenever it’s possible.

That said, the right access is the one that fits your body and your timing. Not everyone’s vessels are suited to a fistula, a graft may be the better choice for some, and a catheter is sometimes genuinely necessary at the start. The surgeon and your kidney team decide together.

How long does a fistula take to mature?

A new fistula can’t be used the day it’s created. The connection has to mature — the vein needs time to enlarge and toughen enough to handle dialysis needles and the higher blood flow. That typically takes about six weeks to a few months, and it varies from person to person.

Some fistulas mature faster, some slower, and a portion don’t mature fully on their own — needing a procedure by the vascular team to help them along, or occasionally a second attempt. None of that is a failure on your part; it’s simply why a fistula is planned well ahead rather than at the last minute.

A fistula isn’t ready the moment it’s made — it needs weeks to months to mature. Planning early is what lets it be ready before you need it.

Why plan ahead?

The single most important thing about access is timing. Because a fistula needs weeks to months to mature, the ideal is to have one created and ready before dialysis is needed — so you can start on a durable access instead of a temporary catheter.

When kidney disease is advancing, your nephrologist watches your numbers and your symptoms and raises access planning early — arranging the referral to vascular surgery in time for a fistula or graft to be ready. Plan ahead, and you can often avoid a catheter and its added risks altogether. Wait until dialysis is suddenly urgent, and a catheter may be the only option left while a permanent access catches up. This is one of the biggest reasons we talk about access long before the day arrives.

Getting close to dialysis? Let's get your access planned in time.

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How we monitor and protect your access

A working access usually gives warning before it fails — and monitoring is how those warnings get caught. Georgia Nephrology focuses on managing and watching your access so dialysis keeps going smoothly:

Routine checks — looking, listening for the bruit (a whooshing sound), and feeling for the thrill (a buzzing vibration) that confirm a fistula or graft is flowing well
Watching the flow at dialysis — trouble placing needles, a drop in flow, or longer bleeding afterward can be early clues to narrowing
Catching narrowing (stenosis) and clots (thrombosis) early — before they slow or stop the access — and coordinating treatment with the vascular team
Managing catheters, including steps to lower the risk of infection
Coordinating placement and repairs with vascular surgery, staying involved throughout

When a problem is found, the access is created and repaired by a vascular surgeon — we coordinate the referral, the timing, and your ongoing care, and arrange a temporary way to keep dialysis going if one is needed. Because our physicians are present at the dialysis centers where you’re treated, an issue gets noticed and acted on quickly rather than falling between offices.

Catching a narrowing early is far easier than rescuing an access that has already clotted — and a well-functioning access means safer dialysis with fewer interruptions.

Catheter care and infection prevention

When a catheter is in use — usually as a temporary measure — keeping it clean is the priority, because catheters carry the highest infection risk of any access. Care centers on careful, sterile handling at every dialysis session, keeping the dressing clean and dry, and watching closely for any sign of infection: redness, swelling, warmth, drainage, or fever and chills.

Because a catheter is meant to be a bridge, much of catheter care is also about moving on from it — getting a fistula or graft placed, matured, and ready so the catheter can come out as soon as it safely can.

How you can protect your access

You’re an essential part of the team. A few habits go a long way toward keeping a fistula or graft healthy:

Check it every day — feel for the buzzing thrill so you’ll notice quickly if it changes
Protect the access arm — no blood pressure cuffs, blood draws, or IVs in that arm
Keep it free — avoid tight sleeves, watches, or jewelry on that arm, and don’t sleep on it
Keep the skin clean to lower infection risk, and don’t scratch or bump the site
Speak up early — tell your care team about any change in how the access feels, looks, or sounds

Tell your care team promptly if you notice the thrill weakening or disappearing, new swelling, redness, warmth, pain, or drainage, bleeding that’s slow to stop after dialysis, or problems during a session. Caught early, many access problems can be solved before they ever interrupt your treatment.

Noticing a change in your access? Let's take a look.