Note: We do not offer pregnancy or pelvis ultrasounds.
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Swollen Leg? It Could Be a Blood Clot. Don’t Wait to Get Scanned

October 27, 2025

 Noticed leg swelling after a flight, long car trip, or even just from sitting too long? While it may seem minor, leg swelling after flight or during periods of inactivity can be a warning sign of a more serious condition: a blood clot. Getting a vascular ultrasound early could prevent severe complications and even save your life.

 

What Causes Leg Swelling, and When Should You Worry?

There are plenty of reasons your leg might swell from mild fluid retention to a more serious condition like deep vein thrombosis (DVT) or superficial vein thrombosis (SVT). But how do you know when it’s time to get checked?

Here’s the difference:

  • DVT: A clot in the deeper veins, usually in the leg. This can break off and travel to the lungs causing a life-threatening pulmonary embolism. 
  • SVT: A clot in a superficial vein, often visible or palpable under the skin. It’s less serious but still needs medical attention.

If you’ve experienced leg swelling after flight or prolonged sitting, or if the swelling is one-sided, painful, or accompanied by redness, it’s a good idea to get checked.

 

Common Symptoms of a Blood Clot in the Leg

A venous blood clot can present subtly, which is why so many people overlook it. Here’s what to watch for:

  • Swelling in one leg only
  • Redness or discolouration
  • Warmth to the touch
  • Cramping or pain in the calf or thigh
  • Heaviness or aching when standing
  • Visible or hardened veins

These symptoms are usually also important to note if they develop after flying, extended immobility, recent surgery, or if you have a family history of clotting disorders.

Travel is a known risk factor, check out this article on DVT and travel → Here’s how to reduce your risk of DVT when flying.

 

When to Book a Vascular Ultrasound

If you’re experiencing any of the above symptoms particularly leg swelling after flight, a vascular ultrasound is the most accurate and non-invasive way to check for DVT or SVT.

Capri Ultrasound performs duplex venous ultrasounds, which use high-frequency sound waves to assess blood flow and detect clots in both deep and superficial veins. Ultrasounds are painless, radiation-free, fast and accessible. Capri Ultrasound also offers bulk billing ultrasound for all eligible patients under medicare and we accept all referrals. 

 

What Happens During a Leg Ultrasound?

The scan typically takes around 10-20 minutes. A trained sonographer will apply gel and use a handheld device (transducer) to view the veins in your legs in real time. You may be asked to move or shift position to help assess blood flow dynamically. If both legs need to be assessed, a bilateral limb scan can be performed.

 

→ Understanding the Medicare Billing Rule

If a bilateral venous ultrasound is required (i.e. both legs), Medicare reimburses 60% of the rebate for the second scan. By doing both legs on the same day, the clinic essentially sacrifices 40% of the revenue for the second exam.

At Capri Ultrasound, we follow all Medicare billing guidelines. That means:

  • No unnecessary fees
  • Bulk billing available for eligible patients
  • Transparent pricing

Other clinics may charge full price for both legs, leaving patients with hundreds in out-of-pocket costs. We don’t believe in that.

 

Why Leg Swelling After a Flight Matters

We get this question all the time and it is a popular search query on google for people searching ‘leg swelling after flight’. Sitting for long periods, especially during international flights, can slow down circulation, making it easier for clots to form. While not everyone who experiences swelling has a DVT, it’s one of the most common and overlooked early signs. If the swelling appears suddenly, affects only one leg, or worsens over time …it should never be ignored.

 

Why Choose Capri Ultrasound?

At Capri Ultrasound, we prioritise your health, your time, and your budget. Here’s what makes us different:

  • Expert vascular sonographer
  • Fast access to appointments
  • Bulk billing ultrasound available for eligible Medicare referrals
  • Trusted by Gold Coast GPs and specialists
  • Clear communication with your referrer post-scan.

 

Final Thoughts 

Leg swelling after flight or immobility isn’t always harmless. It can be a warning sign of DVT or SVT, both of which are best diagnosed early through ultrasound. Don’t wait until symptoms worsen or complications develop.

A quick scan could give you peace of mind or catch something serious before it becomes dangerous.

Book Your Ultrasound Today if you’re dealing with unexplained leg swelling, pain, or redness especially after travel or sitting for long periods. Get peace of mind. Get scanned.

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As a bulk-billing practice, we are deeply committed to providing accessible, high-quality healthcare to our community. To sustain this service, we rely on our appointments being filled. When an appointment is missed or cancelled at the last minute, it results in lost resources that make it increasingly difficult for us to maintain our bulk-billing model for everyone.
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We understand that undergoing medical imaging can be an anxious and stressful experience, and our team is fully dedicated to supporting you with care and empathy. However, creating a safe, calm, and respectful environment for our staff and other patients is our utmost priority.
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  • Professional Boundaries: We expect all interactions with our team whether in person, over the phone, or via digital communication—to be respectful. Rude, aggressive, abusive, demanding, or entitled behaviour will not be tolerated under any circumstances.
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