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There are several tests that can be undertaken to get more information about your veins.
The most common one is a duplex ultrasound scan which can detect the movement of blood in the veins and thus tell if they are damage or blocked.
An MRI scan is undertaken to look at the veins in side the chest abdomen or brain and is also used if a venous malformation is suspected
The use of venograms (where radio contrast is injected into the veins) as a primary investigation is now rare