Can ultrasound detect blood clots? Using ultrasound to spot blood clots: how it works

Ultrasound is a safe and non-invasive way to detect blood clots in the body. It’s often the first test ordered when a doctor suspects deep vein thrombosis (DVT) or other vascular concerns. Using high-frequency sound waves, ultrasound creates real-time images that help show how blood flows through your veins. This is especially useful in the legs, where clots often form and can cause serious problems if not found early.

How ultrasound helps detect blood clots

Doctors use a special kind of ultrasound called a venous Doppler or DVT ultrasound to look for clots in the veins. This test helps identify blockages or slow blood flow that could be caused by a clot.

Here’s how it works:

• A gel is applied to your skin to help sound waves move smoothly
• A handheld device called a transducer glides over the area being scanned
• Sound waves bounce off your blood vessels and return to the transducer
• A computer turns those sound waves into pictures on a screen
• If there is a blood clot, it may show up as a dark mass blocking the vein

What to expect during a vascular ultrasound

The scan is painless and usually takes 30 to 60 minutes. You’ll lie still while the technician checks the area where a clot is suspected—most often the legs. If you're dealing with leg pain, swelling, or sudden tenderness, your doctor may schedule a vascular scan for blood clot detection right away.

You don’t need to fast or prepare in most cases. Just wear comfortable clothing and follow any specific instructions from your clinic.

When you might need a DVT ultrasound scan

You may be sent for a vascular ultrasound test for blood clot if you have:

• Swelling in one leg
• Pain or tenderness in the calf or thigh
• Skin that feels warm to the touch
• Red or discolored skin on the leg
• A recent long flight or period of sitting still
• A family history of clotting problems

Doctors also use Doppler ultrasound blood clot screening to check patients who have had surgery or who are at risk due to other medical conditions.

Benefits of ultrasound for blood clot diagnosis

• Non-invasive: No needles, no incisions
• No radiation: Unlike CT scans or X-rays
• Fast results: Many clinics offer same-day answers
• Widely available: Most cities have local imaging centers

Where to go for a scan in Ottawa

If you're searching for vascular ultrasound services near you or want to book a DVT ultrasound, there are many clinics in Ottawa that can help. CDNcare offers safe, reliable imaging including venous Doppler scan appointments for those concerned about blood clots.

How to take action

• If you have symptoms, don’t wait. Ask your doctor if you should schedule a vascular scan for leg pain
• To stay ahead, check if you qualify for a non-invasive clot detection ultrasound
• You can also find an ultrasound clinic for DVT that accepts walk-ins or same-day appointments

While Canadian Diagnostic Network provides specialized care, many reputable clinics offer similar treatments. Always seek multiple opinions before deciding on treatment.

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