How does the procedure work?

First, the skin at the injection site is thoroughly cleaned and disinfected. A vein on the top of the foot or in the crook of the arm is usually chosen. The contrast dye is slowly injected into the vein through a fine needle or a small access point. Several X-ray images are then taken. The contrast dye spreads quickly through the vein system and makes the blood vessels stand out clearly on the images.

During the procedure, a mild feeling of warmth may occur when the contrast dye is injected. Some people notice a brief tingling or sensation of pressure, but this usually passes quickly. The actual procedure itself only takes a few minutes. Afterwards, the access point is removed and the injection site is pressed briefly to stop any bleeding.

What does a phlebography show?

A phlebography can show the veins in great detail. Doctors can see on the images whether the blood vessels are open, or whether there are any narrowings, blockages, or alternative pathways the blood is taking. Changes to the vein valves, which are important for blood flow, also become visible. This makes it possible to find out, for example, whether a thrombosis is present or whether varicose veins are causing backflow problems.

The procedure helps to determine the exact extent and course of a vein condition. This is especially important when a specific treatment is being planned, such as surgery, a catheter procedure, or deciding how long a course of medication is needed.

Are there any risks or side effects?

As with any procedure involving a contrast dye, allergic reactions can occasionally occur. These usually show up as a skin rash, itching, or in very rare cases, circulatory problems. The risk of serious complications is low. Anyone who knows they have an allergy to contrast dye should make sure to mention this before the procedure.

People with reduced kidney function should speak to their doctor beforehand, as the contrast dye is filtered out through the kidneys. A special assessment may also be needed for anyone with a known thyroid condition. The radiation exposure from the X-ray images is relatively low and is comparable to other imaging procedures.

At the injection site, there is a small chance of minor bleeding, bruising, or inflammation. These issues usually clear up on their own.

What alternatives are there?

In recent years, other imaging procedures have become established that can replace phlebography in many cases. Duplex sonography, which is a special type of ultrasound examination, is now the standard approach for diagnosing a vein thrombosis. It requires no contrast dye and no X-ray radiation. Phlebography is therefore usually only used when the ultrasound examination does not give clear enough results, or when very precise information about the vein system is needed.

Magnetic resonance imaging (MRI) and computed tomography (CT) with contrast dye are further alternatives that may be used depending on the clinical question. The choice of method always depends on which veins need to be examined and how urgently an exact diagnosis is required.

What happens after a phlebography?

After the procedure, no special aftercare is usually needed. Most people can return to their normal daily routine straight away. It is a good idea to drink plenty of fluids to help flush the contrast dye out of the body quickly. If there is increased swelling, redness, or pain at the injection site, it is advisable to seek medical advice.

The images are reviewed by a specially trained doctor. The results are then shared and the next steps are discussed. Depending on the findings, a course of medication, compression therapy, or a surgical procedure may be recommended.

Phlebography is therefore a well-established and safe procedure for reliably identifying vein conditions and planning the right treatment.