You will usually be asked to fast for six hours before the procedure. If you require insulin or take blood thinning medications such as warfarin or aspirin, you will need to discuss with your referring doctor as it may not be necessary to stop taking these medications during your fasting period. Your referring doctor will advise you about this.

The area of skin around the site of the venous access will be cleaned. A local anesthetic is then injected to numb the skin at the site of the venous access. 

Using images or pictures from an ultrasound machine, a small incision is made in your skin. A needle is then inserted. Once the vein has been accessed, x-ray images are used to guide various specialised flexible wires, small plastic sheaths and the venous access catheter. The tip of the catheter is placed deep into the central vein and positioned accurately using x-ray images. 

The catheter or port is then flushed with normal saline (salt water) and a special medication called heparin to prevent any blood within the catheter from clotting. All incisions are then sutured (closed) and firm adhesive dressings applied.

In most cases, there are no major after effects. 

Occasionally, you may have some bleeding at the skin site where the procedure was carried out. If this occurs, it is usually within the first hour after the procedure. The bleeding can be easily treated by medical staff.

The procedure usually takes approximately 30 minutes.

Your doctor will receive a written report on your test as soon as is practicable.

It is very important that you discuss the results with the doctor whom referred you so that they can explain what the results mean for you.