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Deep vein thrombosis (DVT) occurs when a blood clot forms in a deep vein in the leg or arm. There are two types of veins in the leg: superficial veins which lie just below the skin and can be seen on the surface, and deep veins which lie deep within the leg muscles.
A DVT is a deep vein thrombosis, a blood clot, in a vein that is deep inside the leg. In addition to ultrasound, other tests to detect a DVT are a D-dimer (blood test) and venography. Are you aware of either of these having been done? As far as cellulitis, other conditions with similar symptoms have to be ruled out. And conditions that can cause cellulitis have to be considered, such as diabetes. If she has infection, a CBC (blood test) could either rule it out or include it.