AV Fistula for Dialysis: Why It Should Be Created Early
Posted 16 Jul 2026 | Source:

For anyone who may need haemodialysis, one piece of preparation stands out for its importance: creating the right kind of access in advance. The preferred access for haemodialysis is called an arteriovenous fistula, and because it takes time to become ready for use, it needs to be created well before dialysis is required.

This article explains what a fistula is, why it is preferred, and why early creation matters so much.

What is an arteriovenous fistula?

Haemodialysis works by drawing blood from the body, passing it through a filter, and returning it. To do this effectively and repeatedly, a reliable point of access to the bloodstream is needed, capable of providing a good flow of blood. An arteriovenous fistula — usually shortened to AV fistula — is created by a small surgical operation that joins an artery to a nearby vein, most often in the arm. Over the following weeks, the increased blood flow causes the vein to enlarge and strengthen, becoming able to provide the flow needed for dialysis and to withstand repeated needling. This process of enlarging and strengthening is called maturation.

Why a fistula is the preferred access

A fistula is regarded as the best form of haemodialysis access because it is made from your own blood vessels, with nothing artificial left permanently inside the bloodstream. Compared with the alternatives, a well-functioning fistula tends to last longer, work better, and carry a lower risk of infection and other complications. The main alternatives — a graft using an artificial tube, or a catheter, which is a tube placed into a large vein — are valuable in certain situations, but they generally carry higher risks, particularly of infection in the case of catheters. For most people, a fistula is therefore the goal.

Why timing is everything

Here lies the crucial point: a fistula cannot be used immediately after it is created. It needs time to mature — typically a matter of weeks to months — before it is ready to support dialysis. This means that to have a working fistula available when dialysis is needed, the operation must be done well in advance. If a fistula is created too late, or only when dialysis has already become urgent, it will not be ready in time, and a catheter will have to be used in the interim, with its associated higher risks.

This is why nephrologists place such emphasis on referring patients for fistula creation ahead of need, during the pre-dialysis window. It is one of the clearest examples of how planning ahead translates into better, safer care.

What having a fistula created involves

Creating a fistula is usually a relatively minor operation, often done under local or regional anaesthetic, sometimes as a day procedure. Beforehand, the blood vessels of the arm may be assessed, sometimes with an ultrasound scan, to choose the best site. After the operation, there is a small wound that heals over a short period, and then the maturation process begins. During maturation, you may be given simple exercises, such as squeezing a ball, that can help the fistula develop.

Looking after your fistula

Once you have a fistula, looking after it helps it last and work well. This includes some practical habits: protecting the arm with the fistula from injury, not allowing blood pressure measurements or blood samples to be taken from that arm, not wearing tight clothing or jewellery on it, and not sleeping on it. You will be taught to feel for the fistula’s characteristic buzzing sensation, called a thrill, which indicates that blood is flowing through it well, and to check for it regularly. If this sensation changes or disappears, or if the area becomes painful, red, or swollen, you should seek advice promptly, as early attention to a problem can often save the fistula.

Protecting your veins before a fistula is even planned

There is an additional point worth knowing for anyone with advancing kidney disease, even before a fistula is planned. The veins of the arm, particularly the non-dominant arm, are precious for future fistula creation. Repeated blood tests and drips in these veins can damage them and make a future fistula harder to create. For this reason, people with advancing kidney disease are often advised to protect the veins of one arm, having blood taken from the back of the hand or the other arm where possible. Mentioning your kidney disease to anyone taking blood helps protect these vessels for the future.

The takeaway

An AV fistula is the best access for haemodialysis, but its key feature — that it needs time to mature — means it must be created in advance. Planning fistula creation ahead of need, and protecting your arm veins in the meantime, are among the most concrete and valuable steps you can take if haemodialysis may lie in your future. This is best arranged in good time with your nephrologist.

If haemodialysis may be in your future, creating a fistula in good time is one of the most important preparations you can make. A nephrologist can advise on the right timing and arrange it. A video consultation is a convenient way to plan ahead.