Only in rare cases when the diagnosis is suspected but sonogram and blood tests are inconclusive, the health care provider may also order a special x-ray study (venography) in which a dye is injected into the vein to see whether a clot is blocking blood flow. If DVT is suspected, the health care provider may recommend a sonogram (ultrasound) of the swollen leg or other part to measure blood flow in the area and a blood test (D-dimer). The health care provider will ask about symptoms and do an examination. Symptoms are pain, tenderness, warmth, swelling, and redness in the area. Overweight, air or car travel for prolonged periods, using certain oral contraceptives and estrogen replacement therapies, cancer, and family or personal history of blood clotting problems can increase the risk of DVT. Prolonged bed rest (more than 3 days), recent surgery (with anesthesia for more than 30 minutes), smoking, being If the clot moves to the lungs, a pulmonary embolism (blocked vein in the lungs) occurs and life threatening breathing problems can develop.ĭVT most often affects people who are physically inactive, elderly, pregnant, or have blood disorders that increase the risk of blood clotting. The area becomes swollen, red, and painful. The clot (thrombus) causes blood flow to slow. Affected veins are usually deep in leg muscles but can also be in other areas. Deep vein thrombosis (DVT) is an illness that develops when the blood clots in a vein.
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