How is SVT diagnosed?

How is superficial vein thrombosis diagnosed? So firstly superficial vein thrombosis is diagnosed what we call clinically, so after examining and taking a history from the patient you've got a good idea that someone's developed superficial vein thrombosis. However, the gold standard is to undertake a lower limb ultrasound scan or what's known as a venous duplet scan and this is important first of all to correctly diagnose so it will spot the superficial vein thrombosis but what you also need to do is a whole scan of the leg to check the deep veins as well because around one in four people who present with a superficial vein thrombus will also have a clot in their deep veins that they weren't aware of and that obviously needs treating.