<unk>  (also called phlebography) is a procedure in which an x-ray of the veins, a venogram, is taken after a special dye is injected into the vein or even bone marrow. It is the gold standard for diagnosing acute deep venous thrombosis although its use has been largely supplanted by the less invasive Duplex ultrasound scanning.<unk>  can also be used to distinguish blood clots from obstructions in the veins, to evaluate congenital vein problems, to evaluate veins prior to treatment of chronic venous insufficiency, to see how well the deep leg vein valves are functioning or to identify a vein for coronary artery bypass grafting.
Venography
Lymphangiogram
Angiogram
Varicose veins ultrasound
Varicose veins CT
FibroTest
Thermography 
Magnetic resonance angiography