The meta-analysis included 26 articles containing 41 individual studies with a total of 3951 patients without symptoms of DVT. The study quality and the risk of bias were evaluated using QUADAS-2, with heterogeneity was assessed and quantified by the Q score and I 2 statistics, respectively. There were 4 different classes of subgroup analysis-the class of patients stratified by location of US exam (proximal, distal, whole leg), the class stratified by technique (color/doppler, compression, both modalities), the class stratified by kind of surgery (orthopedic, otherwise hospitalized) and the class stratified by era of publishing (1980s, 1990s, 2000s). A meta-analysis was performed using Meta-DiSc (version 1.4), providing the pooled sensitivity, specificity, positive (LR+) and negative (LR–) likelihood ratios of the detection accuracy of US. Full-text reports on prospective diagnostic studies involve the detection of lower-limb proximal and distal DVT in patients without symptoms of DVT using US and venography. If a follow-up exam is necessary, your doctor will contact you to schedule that visit.The research team performed a systematic search in PubMed, Ovid, Cochrane, and Web of Science without language or date restrictions. You should be able to return to your normal routine after the test.Ī radiologist will review your results and send a report to your physician within one to two days. Duration of a lower extremity ultrasoundĪ lower extremity ultrasound takes approximately 30 to 45 minutes to complete. A computer will create graphs that represent the blood flow through the vessels. The blood cells cause a change in the pitch of the reflected sound waves as they move through the vessels. The Doppler ultrasound can measure the speed of blood cells as they travel through the blood vessels. You will be asked to lie still during the ultrasound. Images of your blood vessels will be portrayed on the video monitor. Your technician will spread warm gel on your legs and move a small handheld unit called a transducer over the skin. You will be instructed to undress and lie on your back on a padded exam table. It is also important to wear comfortable clothing and bring your doctor's order to the exam.Įxpectations during a lower extremity ultrasound Preparing for a lower extremity ultrasoundIn preparation for a lower extremity ultrasound, follow your doctor's pre-imaging instructions. Blood clots can break off and travel to the pulmonary arteries causing a pulmonary embolism. Candidates for a lower extremity ultrasoundYour doctor may order a lower extremity ultrasound to search for blood clots in the legs. If you are at risk or experiencing deep vein thrombosis symptoms, your doctor will order a lower extremity ultrasound to search for blood clots. A lower extremity ultrasound is a diagnostic imaging test used to evaluate the blood flow through the legs’ major veins.Ī Doppler ultrasound will measure your blood flow and blood pressure by bouncing high-frequency sound waves off the red blood cells circulating in the legs.
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