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Diagnosing DVT

To determine if you have deep vein thrombosis (DVT), your doctor will take your medical history and check for signs of the condition, such as swelling, redness, and skin that’s warm to the touch. However, since 50% of people with DVT don’t have any symptoms1, your doctor will likely order one or more of the following tests.

DVT Tests And diagnostics


Ultrasound is the most common test for DVT

The most common test for diagnosing DVT, an ultrasound uses sound waves to detect a clot and determine whether blood is flowing properly in the affected area. Your doctor may recommend a series of ultrasounds over several days to find out if your clot is growing and to make sure a new clot hasn’t developed.


Doctors use venography tests to diagnose DVT if the results of an ultrasound are unclear

If the ultrasound doesn’t provide a clear diagnosis, your doctor may perform a venography test. He or she will inject a dye into the affected leg and take an x-ray to look for blood clots.

MRI or CT Scans

MRI or CT scans may be used to diagnose DVT

Your doctor may use magnetic resonance imaging (MRI) and computerized tomography (CT) scans to take pictures of your organs and veins and determine if you have a clot.

Blood Tests

A d-dimer test and other blood tests help diagnose DVT

A d-dimer test measures a substance in your blood that is released when a blood clot breaks up or dissolves. Your doctor may recommend additional blood tests to find out if you have an inherited blood clotting disorder that can cause DVT.

About half of the people with DVT blood clots have no symptoms

Get Clarity About DVT Treatments

If you’ve been diagnosed with DVT, it’s important to understand your treatment options. Learn more about the options available that treat DVT and may help reduce your risk of long-term complications.

Explore DVT Treatments

Talk to your Doctor

From understanding your risk of complications to finding out about your treatment options, our Doctor Discussion Guide has important questions to ask your doctor to help clear up the confusion about DVT.

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  1. Centers for Disease Control and Prevention. Venous Thromboembolism (Blood Clots). Accessed October 13, 2015.